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17 mm shows 19mm in EXIF on 17-40mm f4

Started Mar 17, 2019 | Discussions thread
Trevor Sowers
Trevor Sowers Senior Member • Posts: 1,605
Re: 17 mm shows 19mm in EXIF on 17-40mm f4

Marek M wrote:

Hello,

My Canon 17-40mm f4 lens shows a focal length of 19mm in Lightroom and Zoombrowser, on pictures that were taken at 17mm.

I re-tested it, on both 6D and 6D MkII and it is the same.

Lens is set to 17 mm but EXIF shows 19mm.

Does anyone know what would be an explanation?

I am asking out of simple curiosity, it does not present a problem in any other way.

By the way, when picture is taken at 40mm, it shows 40mm in EXIF.

When I bought my 17-40 I fell on ice an banged the lens hard.  I had the same exif issue so I sent the lens in under warranty and explained the problem.  They returned the lens and said they couldn't find any issues and the exif has been normal ever since.

I'm not sure this helps you but it is a relevant story.

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