Showing posts with label issues. Show all posts
Showing posts with label issues. Show all posts

Saturday, March 16, 2019

Can Raspberry Pi boot from USB flash drive? And about how to do it guide.

Simple answer is 'yes, it can' but read on....
Or skip to the "So I will write summary first:" below.
Or skip to the "Raspberry Pi 3 B+ support USB boot.  How about Pi Zero W? Or other Pi?" below.

Not everyone is beginner, I think.

When people looking for how to guide for installing the OS(operating system), they were probably beginner or very first time trying to use Raspberry Pi. If that's the case, step by step guide might be very good choice.

But even so, it is better to explain general concept, I think.

If someone already knew some computer stuff, he or she probably doesn't need that step by step guide. Because Raspberry Pi is computer that means it is same concept.
For example, someone is Windows user like me and some Windows user knew if computer--motherboard support USB booting, Windows user can simply go to the CMOS setting and do boot from the USB stick.
So I'm thinking Raspberry Pi is computer so it might support USB boot, too.

So I'd like to know whether Raspberry Pi support USB boot or not. Or I might have to do something to get USB boot.
That's what I want to know, right?

So I will write summary first:

BCM2837-based Raspberry Pis which were all the Pi 3 models include compute module 3 and Pi 2 Model B v1.2, support USB host and Ethernet boot.

So if you have any of models with BCM2837, you can follow any general install OS guide (and install to the USB flash memory stick) which you might already knew.

And if you have other models include Pi Zero and Zero W, you need single file on your micro sd card and then it will boot from USB memory stick. So you can boot from USB memory stick and also need micro sd card with single file which I will explain below.

thought about boot from SD and then USB.

I am currently using the multiboot via berryboot.

And sometimes, I felt berryboot wasn't enough what I am trying to do. So I am thinking about like that.
3 or 4 OS on SD card and then 1 or 2 OS from USB flash memory.

So I was googling about it like this:
how do i install raspbian on usb memory

And I clicked below guide:

And read this part:
Important information
This tutorial is out-dated and has been updated here: ....
So I did clicked link which is below guide:

I have a Linux machine but most of my data--Raspberry Pi image file and etc, was on Windows which is my main computer.
So I clicked Windows version tutorial--below link.

I appreciate the detail guides. But when I am trying go through this guide it made me very confusing.
See this "Step 2 – Install Raspbian to the micro sd card"
And then "Note: If you’re using a Raspberry Pi 3+, you don’t need to do step 2. Jump straight to step 3."

"Step 3 – Install Raspbian to the USB Flash Drive"
The process is exactly the same as step 2, but this time we choose the USB flash drive as.....

And here--"If you're using a Raspberry Pi 3 Model B+, you can skip step 4."

"Step 4 – Prepare the Raspberry Pi for boot from USB"

"Step 5 – Boot Raspbian from USB Flash Drive"

I realised that it is exactly same step as install Raspbian on micro sd card.

I have Raspberry Pi 3 B+ and Pi Zero W. So I already knew how to installing any OS on micro sd card.

As you can see, it took very long time to figure out.
Unfortunately, I clicked very old guide--May 2013. That probably is the reason though.

Raspberry Pi 3 B+ support USB boot. How about Pi Zero W? Or other Pi?

I am thinking newer Pi can support boot from USB memory stick but how about Raspberry Pi Zero W which I also have.

So I googling about it and found this:

This question already reveal how to do the booting from USB stick.

Quoted from the question.
The older Raspberry Pi's (Pi 1, Pi 2 and Pi Zero) couldn't boot from a USB-device, but the Raspberry Pi 3 has support for it. The Pi and Pi 2 have semi-support for it (using an SD-card with a single bootfile).

So if I wanted to boot from USB stick in Pi 1 and 2, I can place single bootfile--which I don't know it yet.

And other people answered that Pi Zero W use older chip like Pi 1 and 2.

And then I found someone wrote about that single bootfile--bootcode.bin.
And pointed to the source:
Special bootcode.bin-only boot mode section in Raspberry Pi boot modes - raspberrypi/documentation
Quoted from above link:
USB host and Ethernet boot can be performed by BCM2837-based Raspberry Pis (these are all Pi 3 models, and some Pi 2Bs). In addition, all Raspberry Pi models can use a new bootcode.bin-only method to enable USB host and Ethernet booting.

Just format an SD card as FAT32 and copy on the latest bootcode.bin.

This is useful for the Raspberry Pi 1, 2, and Zero models, which are based on the BCM2835 and BCM2836 devices, and in situations where a Pi 3 fails to boot (the latest bootcode.bin includes additional bugfixes for the Pi 3, compared to the boot code burned into the BCM2837).

If you have a problem with a mass storage device still not working even with this bootcode.bin, then please add a new file 'timeout' to the SD card. This should extend the time it waits for the mass storage device to initialise to six seconds.

I'm not 100% for sure yet. But if Raspberry Pi use BCM2837, USB host and Ethernet boot will support.

And I found all the Raspberry Pi specifications from Raspberry Pi - Wikipedia.
Screenshot of Wikipedia's Raspberry Pi Specifications section.
And as you can see, Pi 2 Model B v1.2 uses BCM2837. And all the Pi 3--3 Model A+, 3 Model B, B+ and Compute Model 3, lite, 3+.

So if you have Pi 2 Model B with v1.2, Pi 3 series and Compute Model 3 series, you can just install any OS on USB stick and remove micro SD card.

If you have other version include Pi Zero W, you can format the micro SD card and copy the bootcode.bin file.

Yes, I haven't tried it yet. But I think those are from the Raspberry Pi's official repository.
So I'm sure it will work.

Kali and Raspbian booted from USB flash drive.

I probably have to get more information about it so I just found this:
quoted from above link:
HawaiianPi wrote:
The Pi3 will check for a boot SD card first, before booting from a USB device. If no boot SD card is found in 5 seconds, then it looks for a boot USB device.

I think this is quite similar process as USB boot in PC--desktop and laptop computer.

When I read from above link, someone said some USB disk won't work. And I wasn't sure about it--If it's FAT32, why it shouldn't be.

But first I tried with quite old 8GB USB stick, it didn't work--Pi 3 B+ without micro SD card and Pi Zero W with single file on micro SD card.
So I thought I need to do something.

And I realised this could be compatibility issue. So I put my kind of new memory card read which can read SDXC format card, too.


As you can see that micro sd card slot is empty.
Kali lite booted from USB Flash memory stick in Raspberry Pi 3 B+.
That USB memory stick doesn't work with USB boot--I tried like 2+ os and also with Pi Zero W.

This time, I tried same USB memory card reader with Pi Zero W. And it worked well.
And I had to put single file in micro sd card.
Raspbian stretch booted from USB Flash memory stick in Raspberry Pi Zero W.

If you'd like to connect more than two USB stick, portable hard disk or SSD, things became quite complicated. Because Raspberry Pi doesn't know which USB drive to boot from.

So you have to search more about it.

I hope you did learn about the basic concept or process of USB boot in Raspberry Pi.

Friday, March 15, 2019

Adafruit's Portable 5 inch Monitor with HDMI DIY looked interesting. But in reality....

I've seen this video: Portable HDMI Display for Raspberry Pi - YouTube

And I thought it looks very nice and quite useful because it isn't only for the Raspberry Pi--I can use as my DSLR monitor or game console monitor as well--I have a Nintendo NES classic edition which is kind of portable console.
So I'd like to do this....

It's expensive than I expected.

But when I saw inside of it, it shouldn't be easy to do.
Building the portable monitor won't be easy, for sure--I haven't done soldering before. But it requires a lot of parts to buy, too.

And if I do this, I might learn a lot of things about Adafruit, for sure.

So I visited building guide wep page.
Overview | Portable 5in Monitor with HDMI | Adafruit Learning System

And I realised I don't only spend a lot of time, I need a lot of money to building it, too.

  • 5.0" 800x480 TFT Display $29.95
  • TFP401 HDMI Breakout $24.95
  • FPC Extension Board $4.50
  • Powerboost 1000C $19.95
  • 2500mAh Battery $14.95
  • Slide Switch $0.95
  • Tripod Screw Insert $1.50
  • Total: $96.75

I thought this is too expensive for me. I need other things like print 3D case and lots of tools to do this.

So when I go through their guide, I saw that it can powering up the screen through USB.
That means, I can simply use my smartphone powerbank.
So no need to buy Powerboost 1000C and 2500mAh Battery.
And I don't have 3D printer so I don't need slide switch and tripod screw insert, too.

So I need three parts--5 inch display, TFP401 HDMI breakout, FPC extension board.
So total $59.4.

Cheaper or even better alternative--Aliexpress.

That means I don't need to do this.
Because I can simply buy from cheap Chinese store in Aliexpress, like this:
This is screenshot of 5 inch capacitive lcd display from Livetime Store in Aliexpress.
5 inch Raspberry Pi 3 Model B+ Touch Screen 800*480 Capacitive LCD Display + HDMI Cable + USB Cable + CD for Raspberry Pi 3-in Demo Board Accessories on

This is 5 inch capacitive touch display. And it costs $38--include free international shipping.
This model was different driver board design than 5 inch resistive display so I couldn't find case for this model.
5 inch resistive display case costs $6 to $10 in Aliexpress.
I can buy 5 inch display with case for about $48.

So it's much cheaper and better(include touch panel) than Adafruit's.
I know this because I just ordered one from there. So I search the a lot of similar--5 inch lcd.

If I wanted to learn about Adafruit, I probably can invest that much time and money.
But now I'd like to more focus on Raspberry Pi--and programming.

So I will buy 5 inch capacitive touch display.

You can also buy other 5 inch screen from Aliexpress like this:

This is the screenshot of '5 inch lcd hdmi' search result in Aliexpress.
Buy 5 inch lcd hdmi and get free shipping on

This is the screenshot of '5 inch screen' search result in Aliexpress.
Buy 5 inch display and get free shipping on

When you are searching the lcd screen, it doesn't show up many items. But you can find store that specialize in Raspberry Pi or SBC(single board computer). So you probably have to check Raspberry Pi store one by one.

It looks hard to build but maybe not that much.

At first, I don't think it's easy thing to do. When I saw this link:
On/Off Switch | Portable 5in Monitor with HDMI | Adafruit Learning System
It doesn't seem to easy, does it?
But if you are thinking about portable project, I think it's worth the effort.

I saw the next page. And if I learn about soldering, I think I can do this.
TFP401 Driver | Portable 5in Monitor with HDMI | Adafruit Learning System

And next,
Display | Portable 5in Monitor with HDMI | Adafruit Learning System
This part need just connect and position the cable. After that, screen is working.

Next part is mounting to the case.

Overall, if I learn and practicing soldering, it shouldn't be so hard.

But I still don't have a 3D printer and I don't like spend that much money.
So I will buy from Aliexpress.

Many of web store like adafruit, elements14, sparkfun, pimoroni were probably based on USA or UK so shipping and currency is too expensive to my country--Korea.
And same kind of store in Korea was all imported from those countries so things were much more expensive.

That's why Aliexpress is the best choice--for me. And probably to you, too.

Monday, December 17, 2018

How the sixty dollar console-Nintendo classic mini, costing an arm and a leg?

Summary – Sad story of a sixty dollar console costing an arm and a leg.
quoted from one of Amazon user's Nintendo NES Classic Edition Console review:

I also found similar one from customer Q&A sections @ #Amazon's Super NES Classic item page
Q: Will we ever have a chance to buy this?...
A: willing to pay but when you make it impossible to get except rip-off-bay it makes it meaningless that....

Simply put - Nintendo didn't make enough products and they just kept trying to shutdown the productions because they wanted sell their other main line product like Nintendo Switch.

Here is evidence of what I said was probably true:
Despite the positive reception, journalists were confused about Nintendo's decision to discontinue the unit as announced in April 2017. Nintendo did not say at launch that the system was meant to be only a limited run, and its...
quoted from Reception section of NES Classic Edition - Wikipedia

Their products are selling so well but they were simply stop producing the product. Does it make sense to you?

NES Classic Edition

Nintendo NES Classic immediately sold out

The NES Classic immediately sold out when it was first released in November 2016, with resellers charging hundreds of dollars for the popular product.
quoted from Nintendo's NES Classic and SNES Classic are going out of production - The Verge

more details from Scalping and bootlegs section of NES Classic Edition - Wikipedia
This, coupled with the extremely high demand, prompted internet scalpers to buy as many as they could, so they could resell them with extreme price markups. In the US, prices were commonly set between $200 and $500, compared to its launch price of $59.99.

Sunday, June 17, 2018

answer--not physically destroy hdd, for erase data from a hard disk so no one can ever recover it.

Thinking about selling used hard drives.

Recently I bought external 2.5" hard disk drive because my external 2.5" hard drivers have low on free space. Copied all the data to new hard drive from old hard drives.
Now I have number of hard drivers--external 2.5" 500GB, 750GB and a few desktop PC 3.5" hard disks that no use. So I'm thinking about to sell it.

Before I'm selling, I needed to clean up the hard disk so no one can recover my personal data. I don't much have important data though--I have a lot of piece of writings and ideas. But I don't think people will understand what those a pieces of writing is for.
I know this because some of those ideas, I already wrote in my twitter or blogs but no one seems to understand what I am saying. So I don't much care about those.
But I have been learning photography so I have tons of photos which I'd like to erase it.

So I did googling and came across this--in Quora:
How do I erase data from a hard disk so no one can ever recover it? 

Why would you like to physically destroy hard disk which you spend a lot of money for?

Quite surprise to see so many answered with physically destroy the hard drive.

I thought -
Nowadays, everyone is sooo rich that everyone suggest to physically drilling, shredding the hard disk.
I'm not rich so I had to completely erase the data before selling.

I know the simple solution without physically destroying it.

I know how software works--because I was a programmer. So I know very easy and simple way. Download some software--bigger size will be better, useless documents or anything from the internet or your not important things like Netflix movie files. And delete all your data. And then copy the downloaded software, documents and all. And kept copy it(same files over and over--make folder to more easier--Windows will make new name for it like below screenshot) until hard disk became zero-ish byte of free space.
screenshot: overwrite files for make unrecoverable

So when the recovery software or professional try to store data from my hard drive, they will only recover those useless data.
It's THAT simple to permanently erase data.
Yes, it takes time. But it perfectly works.

Yes, someone answered what I suggested--overwrite data to remove personal data.
And someone saying that forensic analyse(or something) still can find a bit of information from there. Sure. That might be true.

That's why my solution makes more sense.

Because my personal data was already replaced by thousands, thousands and thousands of files.
That means forensic analyse take more, more and more time to figure out which bit of information connected to the which part of information. It's like thousands, thousands and thousands of jigsaw puzzles to figure out.
And it will be almost impossible because a lot of pieces were missing.

Loren Forslund answered very interesting one and I think it's very good method, too:
My method is using Ubuntu disks utility to break all partitions down and formatting the drive into one “FAT” partition. Now make 2 equal partitions and format them in EXT4 writing over the drive. Now break these partitions back to one NTFS partition over writing the disk. I’m sure if you had one million dollars worth of DOD equipment and 3 months of time you may get a scrap of something, but I doubt anything useful.

People watched way too much TV shows--CSI kind of TV shows.

Especially this part:
I'm sure if you had one million dollars worth of DOD equipment and 3 months of time you may get a scrap of something, but I doubt anything useful.
 - People were watched way too much TV shows
 - and they were way too much talk about this theoretical ideas.

Let's talk about reality.
I told you that I bought a external 2.5" hard disk which has 4TB space--actual size is 3.63TB.
So I put all my old data to this new hard disk..
screenshot: my external hard disk drive's files and folders

Last time, I had a lot of software and documents from the internet. But when I started taking photos, I had to delete those files because nowadays DSLR or mirrorless camera need bigger space to backup.
And other reason is I can always go online to get those software again.  So I don't need to kept in my hard drive.

So in my case, 50% of files(153,598 / 2 = 76,799 files) were probably personal data. But each photo was like 7 to 24 mega bytes only. I have software, downloaded documents, audiobook from Librivox and games and those were far more bigger size than photos.

So even if I have 50 to 70% of files were personal data(because photos I took), 40 to 80% of space were filled with not personal data. That means 40 to 80% of 0.98 tera byte.

That means if forensic analyse find a bit of information, it will quite likely not my personal data. For example, 70% of space were not personal data means:
other not important things - 1,003.52 giga byte * 70% = 702.464 giga byte
my personal data - 1,003.52 giga byte * 30% = 301.056 giga byte
Because my personal data was only 30% chance to picked up by forensic analyse.

And there has more. I have thousands of photos but do you think all of my photos were all very important photos--which I probably use it in my blog.
Photography is my hobby so technically it wasn't very important data.

Even if so, reality is this:
How many professional photographers really use all of their photos they took, do you think?

And how many people do you think they use their hard drive only for their important data?
Even if that's the case, why do they need 1 to 4 tera bytes of hard disk?

I have important documents but most of my documents(which I kept it in text file format--smaller than Word file format.) takes only a few kilo byte.
So I'm sure that a few giga bytes of hard disk should be enough for their personal--important data.

Reality of un-delete kind of software.

How I know this? Because about 10 or 15 years ago, I tried to recover my important data from un-delete kind of software with no success.
I can see the files with so many other files. But I can't recover it because it was already half destroyed--some new files already overwritten some part of those files.

You've known this, too. Good example is 'corrupted file'. Did you recover that corrupted file?

Reality is this:
Even if that forensic analyse find a bit of byte, what can you do with that part of byte?

It was 10 or 15 years ago experience so I have to check. And found this:
Recovering Deleted Files After Formatting: Is it Possible? | Deleted File RecoveryThere are many debates regarding the possibilities of recovering deleted files among computer scientists. All evidence points to the fact that in order to recover files deleted from recycle bin, or any other part of the operating system, they must not have been written over.

In order to recover a deleted file every sector that included data for that file must be in it’s original condition. Overwriting any part of this file with new data will cause corruption.

As you can see, this professional(??) data recovery company saying things were far different than what many people answered in Quora.
Professional data recovery company saying that they can't recover if it's already written over.
But many people in Quora saying that you can recover it--because you can find a piece of information with forensic analyse(or something). So you must do physically destroy hard drive--drilling, shredding, burning and among other physical way.

See the difference.

Even if you recover the part of file, you probably can't read--because of corrupted. But what many people in Quora saying is it can read--recover it.
* If you seen CSI kind of TV show, they can always recover it, don't they?
Yes, you can recover the random data. But do you think that random data is worth a million dollars with spent a few months or a year of work?

That's why I completely agree with what Loren Forslund said:
I'm sure if you had one million dollars worth of DOD equipment and 3 months of time you may get a scrap of something, but I doubt anything useful.

Reality is extremely different than what people were saying in internet, unfortunately.
This is how people kept getting more wrong ideas.

P.S. I found permanent file delete software:
They also explain same thing--overwrite to make unrecoverable.

Tuesday, June 12, 2018

No longer work on metered network to stop Windows 10 auto--force update!

Extremely forceful auto update in Windows 10 Home edition.

- Windows 10 Pro (and Enterprise) edition can easily block the auto update with group policy setting.

I was very irritated by Windows 10 update because it kept bugging me for restart.
So I had to find how to stop Windows 10's auto-update--I did this before about two years ago.

And I found two options:
One is set on metered network in wifi setting--turn on the "Set as metered connection".
Other one is change group policy settings. But this option is available for Windows 10 Pro and Enterprise edition. Mine is Windows 10 Home edition so I can't use this option.
* About two years ago, it wasn't possible to disable Windows 10 update service but now it might possible.

And luckily, I'm using wifi to connect internet so I did use first option.
You can see the screenshot for how I set the metered network:

screenshot - set the metered network in wifi setting

So I didn't get the update for quite while. About a month ago or a few months ago, I thought I needed update Windows Defender so I did use Windows update.

After that, at first I didn't notice much about this red circle with cross mark in Windows Defender Security Centre icon.
But about a month or two months ago, it kept showing the icon in taskbar like this:
screenshot - Windows Defender Security Centre icon

And then I just realise it that suddenly my mouse--actually, I'm using wacom tablet as mouse though, sometimes stuck--not responding like 5 to 30 seconds.
I thought this is because my computer--almost 10 years old laptop computer, was quite old so that is the reason that my mouse was not responding.

But it looks like actual reason is Windows 10 kept trying to update in metered network.
screenshot - auto update in metered network
It said:
Update settings
We'll automatically download and install updates, except on metered connections (where charges may apply). In that case, we'll automatically download only those updates required to keep Windows running smoothly.

So it will automatically download and updates in metered connections, too.

screenshot - awaiting restart in metered connections

I haven't try the disable windows update service yet. I have no other choice--I have to do that to stop auto update.

You can try some of things from here:

Stuck in a Windows 10 update loop - KB4088776

When I'm writing this, I realised that my problem is not only because of that reason. Those update numbers were very familiar--KB4088776.
It kept trying to install the update and then it kept failed like this:
screenshot - couldn't finish installing updates

I think I found solution for looping update of '2018-03 Cumulative Update for Windows 10 Version 1709 for x64-based Systems (KB4088776)' from here:

I'm not sure whether it will fix the problem but there have number of possible solutions so I think I might find a way.

P.S. Additional info. wrote at September 10, 2018:
My laptop computer's wifi network driver not working time to time, if I don't do the update for Windows 10--because metered network--partly blocked update.
Very strange happening--when it happened first time, I thought my laptop computer was too old because it's 8 to 10 years old. But it kept happening again. So I did update Windows 10 and it was okay. But three(or two?) month later it happened again. And just a few days--or a week ago, Windows 10 start showing warning of update. Very similar behaviour like first time.
Now I'm trying to update Windows 10 again. And I will write it again, whether wifi-issue was gone or not.

Additional info. wrote at September 14, 2018:
My guess was right. After update Windows 10, I am not getting wifi-network issues anymore.
So if I don't do Windows 10 update, I can't use internet.

Wednesday, June 6, 2018

Nikon 24mm f/2.8 AI-S Nikkor lens sample photos.

Nikon Nikkor 24mm f/2.8 Ai-s lens technical details:

format: 35mm SLR
type: Prime lens

mount type: Nikon F mount
optical design: 9 elements in 9 group
aperture range: f/2.8~f/22
aperture blade: 7
minimum focus: 30 cm
filter thread size: 52mm
weight: 275g
length: 45.7mm

I don't much care about this technical details of lens. But sometimes it can be useful.
For example, if I already have 52mm uv filter or hood, I can use with this lens.
And I'm walking long hours when I do photo-walks. So if lens wasn't heavy, it was very suitable for me. That is the reason that I mostly shoot with prime lens.
So I do check those things from the technical details.

You can read more about the lens from here:

About the lens evaluation:

I'm not that much good at judging about the lens. But I read quite a lot about the lens from the web.
And quite number of times, I'm finding very strange remark--like this one.

I can't say I really like what Nikon 24mm f2.8 ais produce. And I probably can say I really don't like the corner or edge area--but not all the photos I took. So sometimes or many times, it was quite okay with those corner or edge area.
So if some people saying Nikon 24mm f2.8 ais was bad--because she or he doesn't like what Nikon 24mm f2.8 produce, I probably can agree.

But problem is when some people trying to prove Nikon 24mm f2.8 ais lens were terrible lens--with compare the extremely expensive--excellent lens.
Some people compare this lens with Nikon 24-70mm f/2.8 lens--I don't know much about zoom lens but I think this is one of best zoom lens that Nikon produced, or with Nikon 18-35mm f/3.5-4.5G lens.
Nikon 24-70mm f2.8 costs about $1,800. And Nikon 18-35mm costs about $750.

Nikon 24mm f2.8 ais is old lens so compare with market price wasn't fair. But newer version of this lens is Nikon 24mm f2.4d so it costs $339. You can probably buy Nikon 24mm f2.8 ais lens for about $120 to $200.
Many people were trying to compare with these huge different price tag--$1,800 lens to compare with far less than $339 lens.
Does it make sense to you?

At least, they don't try to compare with Nikon 14-24mm f2.8 lens which quite number of people refer to one of best wide angle zoom lens--not only Nikon lens, among other brand lens like Canon.

This lens can't be really good like Nikon 50mm f/1.8 lens or probably like Nikon 28mm f/2.8 Ai-S lens. But I don't think it is worse than 20mm f/2.8d lens--that also quite hard to judge because 20mm was wider than 24mm lens so corner wasn't worse than 24mm.

Nikon 24mm f/2.8 ais probably wasn't great lens like Nikon 50mm f/1.8 or Nikon 28mm f/2.8 Ai-S(minimum focus to 0.2 meter version). But I think it is quite good lens or at least, it's okay lens--not everyone, of course. And many people include me was slightly disappointed with corner--quite soft.
So if you use with crop body, I think you probably won't disappoint--people have different taste of things so some people might disappoint though.

Photos of the lens that I used.
Nikon Nikkor 24mm f/2.8 Ai-s lens

Nikon Nikkor 24mm f/2.8 Ai-s lens

Technical notes:

These photos were all taken with handheld and I used Nikon lens to Sony E mount or Micro four thirds adapter so I have no idea about aperture number for the photo. Some photos were taken with Nikon D7000 which can recorded aperture number.

When I am taking photos, I do use Raw file format. So I need to convert Raw file to jpg file and during that time, I do some post-processing--this is kind of darkroom process in developing film.
And when I do this, I don't use any default setting from Rawtherapee because there has some image modification settings like sharpening, micro-contrast and among other things.
I don't use Adobe Photoshop but this also has same kind of default setting with sharpening.
This isn't important for photography. But this is about the lens--what kind of photo I can take with this lens. So sharpening won't help to know about the lens.

So when I do use Rawtherapee, I removed all the default setting.
I will do these adajustments, if necessary:
 - click the auto button in exposure tab--automatically calculate the exposure value,
 - adjust exposure value, if overall image was still dark or too bright,
 - adjust contrast(between 3 and 18) in L*a*b* adjustments tab,
 - if there have some areas were too dark or too bright which makes me feel unbalance the overall look, adjust the shadow/highlight value.
 - Sometimes, white balance set to auto. Because Sony A7's white balance value was quite terrible when I do use other brand lens--not Sony E mount lens.

Sample photos:

Nikon D7000 with Nikon 24mm f2.8 lens - Nikon D7000 has crop factor of x1.5 so this lens became 36mm lens.

at the Dongdaemun design plaza, Seoul

at the Guinsa Buddhist temple, Danyang
I was trying to focus center part but it came out like that. But you can see how out of focus part looks like--Nikon D7000 has crop factor of x1.5 so Nikon 24mm became 36mm.
With crop body, it is still useful for close up--or macro shot.

Winter in Guinsa - Korean 'sa' means Buddhist temple.
Winter in Guinsa - Korean 'sa' means Buddhist temple. - from my flickr account.

at the Sincheongyo, Daegu
As you can see from the photo, it was mixture of quite bad pollution, smog and not very bright winter sun light.

Olympus E-P3 with Nikon 24mm f2.8 lens - Olympus E-P3 has crop factor of x2 so this is lens became 48mm lens--not wide at all.

at Sincheongyo, Daegu

at Hanja, Cheongdo
P.S. I forgot to mention that this photo was post-processed with Olympus Viewer 3 program. Because I felt that it has some noise--ISO 200 so I didn't use Rawtherapee.

This photo was cropped out from previous photo. I did use auto-white balance function in Gimp--open source software. For making clear the leaves and water droplets.

Sony A7 with Nikon 24mm f2.8 lens:

at Sincheongyo, Daegu

near Chilseongsijang, Daegu
This is handheld-HDR shot which automatically generate from Sony A7--HDR paiting in Picture effect menu. And it took three shots to make one HDR photo.
That is the reason why you can see left side of photos with ghost--halo of cars.
I did include this photo because this photo shows Nikon 24mm f2.8's capability--Sony A7 wasn't crop body like above's.

Three photos were taken at same spot--Sincheongyo. Olympus E-P3's was slight different angle though.
So you can compare the full frame camera with crop body camera--crop factor of x1.5 and x2.

with tilt adapter:

I have a tilt adapter which can capture diorama style photo.
I don't know much about this diorama effect but I'm just showing what it will do with this adapter.

Nikon 24mm f/2.8 with tilt Nikon-Nex adapter
This is Nikon 24mm f/2.8 lens with tilt Nikon to Sony e mount adapter.

snowing town, Daegu

at Sincheon-dunchi, Daegu

P.S. If you'd like to read in Korean, you can read it from here--this is my Korean blog.

Saturday, August 5, 2017

Gameloft's new way to cheat customer - Asphalt 8 blueprint update.

I was very disappointed about how Gameloft update the game--last year, I think. So I didn't play like a year.

Recently I wasn't very interest to watch movie--which is one of my favourite thing, in my free time. So I'd like to try something else and I decided to try Asphalt 8 again.

Back to Asphalt 8.

I have quite number of cars so I can enjoy some TLE(Time-Limited Event) and MP(Multiplayer). And I can find quite number of new things like Blueprint, Porsche, new map-Patagonia and among other things.

It wasn't easy to familiar with Patagonia map because I don't have new car to try that in career mode or mastery challenge. So I had to do playing so long time in MP because in MP, I can choose the map.

Not bad, I thought.

Doing TLE, I don't have C, B, A and S class king anymore. I don't mind playing with second or third best car. So that's fine.
Actually I was quite surprised that D class king is Mazda RX8.

So at least, I don't have to buy other D class cars and upgrade it--which required credits farming for several hours--doing same thing over, over, , , , , , and over which makes me feel boring.

Anyway, I don't really try to get the cars I don't own because I don't want to do that credits farming.
But I do enjoy playing in multiplayer league(even in free race) so I thought about get good multiplayer cars.
I have some but it was lower rank car so it takes long time to finish the race.

So I try to learn about this Blueprint thing.

Asphalt 8 Exclusive deal.

Here is exclusive deal:
screenshot - Asphalt 8 Exclusive Deals

Exclusive deals.. It sounds very nice, right?
So even Asphalt 8 wikia said like this:
screenshot - Exclusive Deals | Asphalt Wiki | FANDOM powered by Wikia
in addition to massive price drops in offers' prices, partially due to players' complaints.
- source FANDOM powered by Wikia website - Exclusive Deals | Asphalt Wiki

Massive price drop.
Why they can do massive price drop? It was extremely expensive in first place, right?

Some of items, it was slightly discounted for sure.

As you can see first photo, 5 of Extra Tank for 560 tokens. One extra tank price was 200 tokens. So it was really great price.

But not so fast....

See this Blueprint price. Just one Porsche 959 BP, Porsche Cayman GT4 BP for 150 tokens.

According to the Wikia website's Porsche 959 page:
The Porsche 959 costs 1,100 tokens to purchase, according to the game's internal data. Otherwise, the car must be assembled with 14 Porsche 959 BP cards.
For a limited time, it is possible to purchase Porsche 959 Full BP Pack, which contains all 14 Blueprints required to build the 959, at cost of 1,600 tokens, 500 tokens higher than the hidden purchase price.

You can even ignore game's internal data. Gameloft offered 1,600 tokens to 14 blueprints. So about 114.28 tokens for one bp card.
But this exclusive deal sell the car for 2,100 tokens. So this is 500 tokens higher than the limited time offer which is 500 tokens higher than game's internal data.

According to the Wikia website's Porsche Cayman GT4 page:
According to the game's internal data, the Porsche Cayman GT4 costs 2,500 tokens to purchase. To obtain normally, the car must be assembled after collecting 35 Common Porsche Cayman GT4 BP cards.

Unfortunately, this car don't have information like Porsche 959.
One bp card costs 150 tokens. This car need 35 cards to assembled car. So it will cost 5,250 tokens.

As you can see, Gameloft really try to sell twice the original price.

But what you have to know is that this original price was higher than previous cars and they don't perform better than that price.

Their car price was sky-rocketed--because every update, Gameloft did double and triple the cars and earn credits or tokens were not really increased.

Hide price and secretly double or triple the price.

You probably don't believe me. So I will show one more evidence.

I've got other special offer--this one actually made me realised all this.

screenshot - Asphalt 8 Special Offer: Mosler Super GT BP
Grants 10 cards. 1 will be a Blueprint card for the Mosler Super GT!

Special Offer: Mosler Super GT BP for 1,850 tokens. I remember the some blueprints box so I searched it in Asphalt 8 wikia websites.
According to the Wikia website's Pro Boxes page:
Racer Construction Box - Grants 5 random Blueprint cards for 1,100 tokens.
Expert Construction Box - Grants 10 random Blueprint cards for 2,225 tokens.

Expert Construction Box cost 2,225 tokens so it was good price, I thought.
When I tried to upload this screen shot to that wikia website's Pro Boxes page, I found this explanation: Grants 10 cards. 1 will be a Blueprint card for the Mosler Super GT!
I was like 'what?'

10 random cards box costs for 1,850 tokens? If I want to spend that token, I will buy two of champion kit box which I will get 60 cards.

Again, I checked price from Wikia.

According to the Wikia website's Mosler Super GT page:
The Mosler Super GT has a buying price of 14,000 tokens. As of the Car Blueprints Update, the Mosler Super GT can be crafted after obtaining 18 Mosler Super GT BP cards.

This car previously sell with token. So I can exactly calculate. 18 blueprint cards for 14,000 tokens. So one blueprint card costs 777.7778 tokens.

That means 1,072 tokens for other 9 random cards. Champion kit box is 30 cards with at least 10 will be rare or legendry box only cost 950 tokens. Expert Kit box is 8 random cards and it only cost 200 tokens.

Here is the someone commented in Wikia website's Car Blueprints Update page:
After this update many cars that can be obtained by tokens or from events like EDD/R&D has been made into bp cars. So now let's say the Fenyr needs 14k tokens to buy when offer for a limited time. But now it's 20 legendary bps which means 20x2250=45000 tokens. Lol the price is more than tripled. Also if you are not very lucky then you can never get any legendary bps from credits boxes. So those cars has been made almost impossible to get.
12 days ago by A FANDOM user

What I see is... Gameloft make this blueprint for hide price so nobody knew exact price. And then secretly double and triple the price for saying 'Exclusive Deal', 'Great Deal', 'Special Offer'.
It actually means double and triple price deal.

I strongly suggest to check the Asphalt 8 wikia website before you buy those deals.

Wednesday, August 2, 2017

Platycladus trees in Dodong, Daegu. And thought on Kodachrome film.

Platycladus-oriental thuja trees in Dodong forest of oriental arborvitae, Daegu
Platycladus-oriental thuja trees in Dodong forest of oriental arborvitae, Daegu

This is my contribution to Wiki Loves Earth 2017.
This place was designated to the natural monuments of Korea(South). You can see this photo at Korean wikipedia 대구 도동 측백나무 숲 - 위키백과
or here.

Technical note:
Photo taken with Sony A7 and Nikon 105mm f2.5 Ai-s lens.
I don't remember exact aperture number but judging by time--sunset, out of focus area and shutter speed, it probably f/2.5 or f/3.2-ish.
And then raw file processed with RawTherapee.
 - exposure - auto
 - increase highlight and shadow
 - film simulation to Kodak Kodachrome 200
And then that processed jpg file post processed with Gimp.
 - adjust level
 - adjust curves
 - resized to 3600 pixels.

thought on Kodachrome film.

RawTherapee support variety of film simulation so I have more than 100 of film simulation. One of my favourite is Kodachrome. I just don't understand why--even Kodachrome film simulation looked superb, Kodak stopped producing it.
Early 2017, Kodak said they will bring back Ektachrome though so it might possible to Kodachrome, too.

Wednesday, March 29, 2017

This is the reality---how Apple fanboy dominated this world. - Reality of web storage service.

I've got photos from friend--

screenshot from Best Of Quora facebook page

I didn't even read whole thing because I know the cost of web storage.

So I wrote in my facebook timeline:
This is the reality---how Apple fanboy dominated this world.
Do you know how much does it cost for 5giga byte storage for internet?
Do you know even give you free for about 200 times more size--1 tera byte of hard disk? Of course, they will display the advertisement but it was soo small that you will not even notice it.
Are you living in stone age that you think 5 giga byte of storage were some kind of miracle size?
Go and learn how internet became nowadays.

It wasn't really unlimited storage. And it wasn't started like that.

I was quite strange that Google give unlimited storage because there has limit. What I know is it will reduce the size, that's why I've got only 15 giga byte which isn't free at first, if I'm not mistaken.

Google advertised when you buy the android phone, you will get 15 giga byte of web storage.
I thought that 15 giga byte of web storage was really big about 3 to 5(??) years ago. But actually it wasn't.
Because I'm sharing with all of my google services like email, google docs, drives, photos, videos and even here--my blog service.

See. Actually it wasn't big. Because each product has 3 to 5 giga byte which is almost same as any other service.
For example, wordpress which is same as blogger here, give 3 giga byte of storage. You can read details here-Adding Storage Space — Support —
Other example, dropbox which is same as google drive, give 2 giga byte of storage. You can read details here-How much does Dropbox cost? - Dropbox Help - Dropbox
Onedrive which is same as google drive, give 5 giga byte of storage. You can read details here-Microsoft OneDrive Plans

People--even internet technology news writer, actually don't know why google give 15 giga byte. And they think google gave it for free because it was big.

Some of us know 15 giga byte was actually not big. So does Google.

Unlimited storage but compressed image--that means image quality will loss.

So Google offer the unlimited storage with limited photo size. I probably confused about this but if I'm not mistaken, they reduce the size more than half size if it was even 13 mega pixel. That's why I choose upload photos with original quality. I choose that almost year ago, I think.

Google Photos: Unlimited storage for free, with a few gotchas @ June 1, 2015 By Todd Ogasawara
Google Photo gives you unlimited storage space if you are willing to limit photo resolution to 16 megapixels and video resolution to 1080p. You do have the option to store at higher resolutions, but the storage counts against your Google Drive quota.

But it's not only photo resolution. It will compressed image, too.

Choose the upload size of your photos and videos - Google Photos Help
Photos are compressed to save space. If a photo is larger than 16MP, it will be resized to 16MP.

Or if you can buy a Google Pixel phone, you will get unlimited storage without those limitation. You can read here - Google is giving free, unlimited original-quality photo and video backups with the Pixel phones @ Oct 4, 2016 by Lauren Goode

Wait a sec. So Google only offer that much!?

Facebook, almost everyone using nowadays, right?
I've never seen any limitation of photos. People kept uploading it, don't they?
Yes, reduced photo quality(like Google does or more) and size but they gave almost(??) unlimited size, don't they?

How about Instagram?
Do I heard any limitation about photo uploading?
Yes, reduced photo quality(it wasn't much, I think. More for the size, I guess) and size. But they gave almost(??) unlimited storage, don't they?

How about which I mentioned very earlier.
Yes, they offer 1 tera byte of storage.

Do you think do I have to find out all the other websites about the offer? It's enough, right?

See the title of this article. "This is the reality--how Apple fanboy dominated this world."
That's why who has best answer. And choose that--Apple fanatic side of story, for the best of quora.

P.S. Slightly different but almost same story - Illogical idea ruled internet--especially social networking sites. @ March 17, 2017 - my other blog.

P.S. (at April 3, 2019): I found this question at - Why does Google offer unlimited storage for photos via Google Photos app? What's in it for Google?
So many answers include what I mentioned here.
Interesting thing is nobody talked about facebook or instagram. Because I'm sure they know about the websites and very likely using the websites. But they don't even know facebook and instagram gave unlimited photo storage like Google does--I'm sure some of their friends uploaded thousands and thousands of photos.

Friday, January 20, 2017

What dinnertime looks like in 36 different homes - interesting idea but...

I've got news from my friends

What dinnertime looks like in 36 different homes @ Jan. 19, 2017, at 1:33 a.m.
"These intimate portraits invite the viewer to take a seat at the table."

These photos were taken by Lois Bielefeld.

Before talk about the thing that bothering me, I am not saying these photos were terrible or it was terrible idea.
It was indeed interesting idea. And photos were very interesting, too.

But when I looked those photos, I felt quite bad and after half way through those photos, I felt so borded to see already.
It was interesting idea and photos looked nice. But why I felt bored already.

That's why I started thinking about it. And in the comments section, people already talked about it.

Here is some of it:
Ann Smith said "There seems to be so much stress behind these pictures. Several looked like walking in on the middle of an argument or just a loveless home."

Taylor Elizabeth Salmon said "Did the photographer tell everyone to not smile? Because everyone has such a straight, sad face."

Cia Macleod Marsh said "everyone is staring at the camera like a wax model, which they definitely don't do when they usually eat dinner..."
quoted from article's comment section.

And here is what I thought:
I think I might be right that what I thought--it was all terrible set-up scene. Photographer intentionally capture the very depressing scene--after half way, I felt so bored to see the photos.

I don't know about you. But many times, I am enjoy eating. Why you want to crying while you eat very delicious food--of course, we usually eat quite similar thing in daily so it can become a usual thing.
Almost all the people (in the photos) aren't natural and some houses looked as it is. But I felt that almost half of houses, I felt they cleaned up (and set-up) for taking photos.

So I checked photographer's website and then I found that it was a bit better. It didn't say anything about "What dinnertime looks like in 36 different homes".

Photographer said
The focus of Weeknight Dinners is the typical evening meal, when food and space often become secondary to the busy workday.

in Weeknight Dinners — Lois Bielefeld.

Thursday, December 22, 2016

This is how human beings are thinking nowadays. -- to facebook timeline

If you know me, I always suggest to do the blogging. And I was totally right, after trying to find something from old post in facebook group. It was not just taking forever to load(extremely slow)--because mostly useless news articles, photos, etc.
There has zero creative or innovative thought in it.

This is how human beings are thinking nowadays. Don't care about old post. Just always looking for trend.

Everyday we trashed things to this rubbish timeline. And completely forgotten from your memory. And hopping for someone to understand my and your rubbish thought.

My facebook timeline probably also like trash but I'm trying to put some information--something useful, at least.

* I thought about write it in my timeline in facebook but I didn't. Not only because my friends will not understand.
Because I'd like to keep this thought in public so some people can see this.

Wednesday, August 31, 2016

Asphalt 8's rubbish elite tune up, BXR Bailey Blade GT1 Enduro Double Down

I had kind of long break. So when I came back to play, Elite car was already there.
I found out from Asphalt 8 Wikia's Elite Cars Update page--it was released around April 1, 2016.

It wasn't that long then. But at least four months were passed. But Gameloft probably don't even try to fix the problem.
So many people already talked about it. But they don't listen. No, probably they don't care.

It seemed to me that waste customer's credits and tokens(and customer's time) are ordinary thing to them.

When I played with free try elite car from TLE(Time-Limited Event), this tune up things were very messy--because I didn't have any elite car before. I did 'tune up' but a few hours or days later, it was completely gone. Sometimes, it was half full. Or sometimes, played it one or two times, it already became red-stat-car.
At first, I thought I forgot to 'tune up'. But it kept happening.
And many people in the internet community said same thing.

So should I keep watching whether this 'tune up' working properly? Or even screenshots to it for the evidence??

Anyway, when I play this BXR Bailey Blade GT1 EDD (Enduro Double Down), I was worried that this 'tune up' will make problem.
And my guess was totally right.

This was my initial thought - quote from Asphalt 8: Airborne, BXR Bailey Blade GT1 Enduro Double Down First try challenge list. @ August 29, 2016
But it will be very difficult in very different way. This elite car system will degrade car so you have to tune up time to time. And this elite car system always ruined whole play time because sometimes 'tune up' just completely gone or sometimes it will refill only half of 'tune up bar'.....

And fourth tryout, it happened. I just copied whole part from Asphalt 8 4th tryout of BXR Bailey Blade GT1 Enduro Double Down challenge list @ August 31, 2016

Challenge 3. Ace race. London, recommended car rank 1548, AI finished at 1:21:048

screenshot of Asphalt8 Bailey EDD 4th tryout, challenge 3 London

When I tried to do this challenge 3, it was degraded car. So I did Elite car 'tune up'.
screenshot of Asphalt8 Bailey EDD 4th tryout, before challenge 3 - tune up
I took this screenshot at August 29, 2016 21:53 PM.
So I had to wait for almost two hours.

About four hours later, I tried to do the challenge 3. And I've got this:
screenshot of Asphalt8 Bailey EDD 4th tryout, before challenge 3 - tune up gone
That 'tuning up' progress is completely gone. I took this screenshot at August 30, 2016 1:31 AM.

See. That's why I said this at the beginning:
And this elite car system always ruined whole play time because sometimes 'tune up' just completely gone or sometimes it will refill only half of 'tune up bar'.

* Again my guess was right. I did apply the tune up. About 30 minutes later, I checked this 'tune up' thing. But four hours later, it was completely gone. So I had to apply 'tune up' again. That means I had to play next day.
Meanwhile, 2 out of 3 invitation at the time and one invitation was delivered within 2+ hours. So while doing sleep or work, my EDD invitation was fully charged for very and very long time. So I probably wasted one EDD invitation for waiting and again, waiting for complete the 'tune up'.

screenshot of Asphalt8 Bailey EDD 4th tryout, edd invitation is full

But after I spent one invitation, I had to only wait like 4+ hours(it suppose to 8 hours wait for the edd invitation ticket). It's like one hidden space is there so 8 hours probably okay. But if it's more than that, ticket timer will stop. So player must keep 'tune up' and use ticket carefully.

I waited around four hours to 'tune up' but it was completely gone. So I just don't like keep waiting.
So I decided to try with degraded car.
Recommended car rank is 1548. Mine was 1595 with degraded.....

It did mess up with other elite car's tune up.

It happened quite number of times and I remembered it will mess up with other elite car.
So I remembered that I played free try elite car from TLE.

So I check the car in TLE:

screenshot of Apshlat 8 TLE - Cadillac ATS-V Coupe Elite tune up status
That was very strange because I played it about two or three times. But as you see, tune up was almost full-only one part was gone.
Was I confused with previous play?

So I did check the leaderboard because it will show the last time of play:
screenshot of Apshlat 8 TLE - Cadillac ATS-V Coupe Multiplayer Cup Leaderboard
This is screenshot of TLE main screen:
screenshot of Apshlat 8 TLE - Cadillac ATS-V Coupe Multiplayer Cup

Yes, this will prove only played it three hours and thirty minutes before.
But I remembered why I played it and how many times I played it. I was more than 5,000(or 4,500-ish) position so I played it to make that 4 random card boxes. So at least I played a few times.

After I apply the Bailey's tune up. I played this for about two or three times.
After I played this, I checked whether Bailey's tune up was progress or not.

Because this happened(mess up with other elite car) quite number of times so I checked.

So now I stopped play Cadillac ATS-V Coupe Multiplayer Cup because I had to play Bailey EDD.
I played it several times. But it became nothing because I probably can't get anything from this TLE.