Magic Lantern Forum

Developing Magic Lantern => Reverse Engineering => Topic started by: Sapporo on December 16, 2020, 08:22:23 AM

Title: Lens serial number in Exif
Post by: Sapporo 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.
https://community.usa.canon.com/t5/Lenses/All-lenses-should-have-the-exif-info-come-up-on-photos-not-just/m-p/240202

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
https://www.dpreview.com/forums/thread/3160199
https://www.dpreview.com/forums/thread/162667
https://photo.stackexchange.com/questions/46789/how-can-i-compare-the-lens-serial-number-from-the-exif-of-a-picture-to-the-seri#46806

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.
Title: Re: Lens serial number in Exif
Post by: Walter Schulz on December 16, 2020, 09:46:24 AM
Sorry! No correlation found.

Do you have any problem affected by this? Repo, legal, incurance claim, ... ?
Title: Re: Lens serial number in Exif
Post by: Sapporo on December 16, 2020, 11:48:22 AM
Sorry! No correlation found.

Do you have any problem affected by this? Repo, legal, incurance claim, ... ?
The problem may be when a lens gets stolen and the only lens serial number is the one in Exif.
Another thing is the web page stolencamerafinder. If you don't know how it works you will enter the lens serial number that is not the same as the one the web page will search for.
Title: Re: Lens serial number in Exif
Post by: Walter Schulz on December 16, 2020, 01:20:01 PM
Nothing we can do from here.
Only thing I can imagine is trying to contact stolencamerafinder admin and asking him to address this issue in some way. Maybe asking Canon users to look for len's funny number via EXIF and not trying to use a number unable to track.
Title: Re: Lens serial number in Exif
Post by: Sapporo on December 16, 2020, 02:18:36 PM
Nothing we can do from here.
Only thing I can imagine is trying to contact stolencamerafinder admin and asking him to address this issue in some way. Maybe asking Canon users to look for len's funny number via EXIF and not trying to use a number unable to track.
As you can see, people have figured out before how it works with other serial numbers from Canon.