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Topics - Sapporo

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Reverse Engineering / Hot pixel suppression at ISO 6400?
« on: November 24, 2022, 11:17:39 AM »
My two 6D and M5 have less hot pixels at ISO 6400 and above. At 25 seconds exposure hundreds of hot pixels at ISO 3200 and below were reduced 10 times.
Raw samples
Notice that the hot pixels left at ISO 6400 are the ones in pair at ISO 3200.

7D doesn't have the feature. I wonder if newer cameras like R5/RP also have the feature?

Reverse Engineering / Lens serial number in Exif
« on: December 16, 2020, 08:22:23 AM »
Canon added lens serial number in Exif 2004 (28-300 f/3.5-5.6). The tag is a mix of decimals and hexadecimals.

Lenses from 2014 from (16-35/4L IS) have the same lens serial number in Exif as written on the lens.

Samples what Canon has used before

Any idea how to convert lens serial number in Exif to the real lens serial number? I have tried some combinations this morning without result.

An international team of security researchers has drawn our attention to a vulnerability related to communications via the Picture Transfer Protocol (PTP), which is used by Canon digital cameras, as well as a vulnerability related to firmware updates.
(CVE-ID:CVE-2019-5994, CVE-2019-5995, CVE-2019-5998, CVE-2019-5999, CVE-2019-6000, CVE-2019-6001)

Due to these vulnerabilities, the potential exists for third-party attack on the camera if the camera is connected to a PC or mobile device that has been hijacked through an unsecured network.

At this point, there have been no confirmed cases of these vulnerabilities being exploited to cause harm, but in order to ensure that our customers can use our products securely, we would like to inform you of the following workarounds for this issue.

    Ensure the suitability of security-related settings of the devices connected to the camera, such as the PC, mobile device, and router being used.
    Do not connect the camera to a PC or mobile device that is being used in an unsecure network, such as in a free Wi-Fi environment.
    Do not connect the camera to a PC or mobile device that is potentially exposed to virus infections.
    Disable the camera’s network functions when they are not being used.
    Download the official firmware from Canon’s website when performing a camera firmware update.

Models Affected

These vulnerabilities affect the EOS-series digital SLR and mirrorless cameras PowerShot SX740 HS, PowerShot SX70 HS, PowerShot G5X Mark II.

General Chat / Tornado EOS - Trojan or the real thing?
« on: December 29, 2018, 07:36:34 PM »
I read a comment here about changing the language. A new user wrote about Tornado EOS
It seems like SPT but cheaper and also the ability to change the menu language on locked cameras (from Japan). I did a scan with VirusTotal

Size: 188Kb.

In Russian language (google translate it)

"At the moment, I have a lot of groundwork and experience in raising cameras from a complete software corpse. By means of UART, JTAG, programmer. Well, or at least the extraction of calibrations for the subsequent recording of them into a new board, without its soldering.

Familiar to all EOS 1000D when the main display is not working, but the camera in the viewfinder writes BUSY, EOS 5D, EOS 5D Mark II ... this is the most frequent, and it happens on all models."

Seems he has knowledge about the firmware bug in 1000D.

Tutorials and Creative Uses / Tutorial for
« on: February 26, 2017, 11:07:20 AM »
Is there a tutorial for like the one for raw histogram

Hardware and Accessories / The need of low level format?
« on: April 20, 2016, 03:35:24 PM »
I read this article about formating and thought it was like:

"I’d also like to add that I have personally seen a difference in both buffering time of the card, and also a decrease in the amount of corrupted images/cards that I’ve come across since I’ve been formatting cards rather than deleting in some other way. "

And then I read the comments:

"Formatting a card is unnecessary, I know that some photographers feel better to do it so I don't tell them to stop but do a benchmark of a card you used a lot and never formatted and you'll see that the performance is the same as day one.
Formatting is a simple process, it erases your partition and creates a new one but erasing a FAT32 partition created by your DSLR to replace it with the exact same one is not essential."

So why low level format?

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