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lens Ids after firmware update

 
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mphaha



Joined: 26 Jan 2010
Posts: 3

PostPosted: Mon Oct 04, 2010 9:04 pm    Post subject: lens Ids after firmware update Reply with quote

I was very pleased to meet Bo-ming (and his lovely wife) at the London firmware updated meeting last Friday.

After the firmware update, I noticed that my lenses were reporting new (exif) lens identifiers. (61 for CN50 and CN70-200, and 63 for CN100M and CN24-85).

Not a problem - I use exiftool to assign lens names - and I'll just have
to adjust the scripts I use for this. (and untangle assignment conflicts in my existing files)

My question is: are these Ids expected to be stable in future versions of the firmware ?


It would be nice though if you could get Canon to assign some permanent Ids.. 'Smile'

And then get lens correction profiles in lightroom, DxO and the like....
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conurus
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Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Tue Oct 05, 2010 6:07 pm    Post subject: Reply with quote

Well, I've never thought that people would actually use the lens ID, but now I know...

The IDs of converted N lenses are not assigned or approved by Canon. There were two ID changes, at firmware version 3.00 and at 3.10, and no further changes are planned at this point.

The ID ranges from 1 to 255 and as you can imagine there are way more than 255 lenses on the market equipped with an EF mount, so some of them are bound to collide. As you have discovered already, N50 and N70-200 share the same ID 61 and N24-85 and N100 share the ID 63. If you use a script and an exif tool to sort your photographs, you are suggested to use both the lens ID as well as the minimum and maximum focal lengths of the lens.

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I am a bird and I uncovered the E, EF and N-mount communication protocols!
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