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When using Lightroom Classic I have discovered that the default lens correction profile used for a Canon 17-44 f/4L lens looks a bit strange compared to other lenses in my collection.

By default the Profile says "Canon EOS-1D Mark III (Canon EF 17-40mm f/4L USM"

This seems strange because

  1. The lens profile refers to a camera (Canon EOS-1D M3) and not just the lens
  2. The camera it refers to is not mine, nor have I ever even touched this model!
  3. It is different to other default profiles which just refer to the lens, as I would expect (it is lens correction)

See the screenshot

Screenshot len profile problem I can change this to another profile "Adobe (Canon EF 17-40mm f/4L USM)", which is the one I expect by default. But it seems strange to have to do that here, when I don't with other lenses.

For example, below is a screenshot from the default for another lens. 70-200 lens

Here, there is only this single profile available.
And it is the same for all the other lenses I have tried. It is only the 17-40 which seems to have the issue.

Although I can't spot any difference in the profiles, it is strange.

Does anybody know what the problem is and how I can resolve it?

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  • What camera is it? A 1D mk3? – xenoid Oct 27 '19 at 8:41
  • Do you mean which camera did I use to take the photos? A Canon 80D and the same also occurs when another user uses a Canon 77D with the same lens, and uses lightroom on a different PC (different subscription). – jason.kaisersmith Oct 27 '19 at 14:32
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    I noticed yesterday that a photo I had taken a couple of days ago with my Canon 5D Mk IV and Canon 17-40 f/4 of Lake Michigan had a warped horizon (raised slightly in the center). I just figured the lens profile correction in Lightroom wasn't completely accurate. After seeing your question I went and looked and indeed I had the same problem you describe. After changing it to the Adobe one, the horizon is now straight! So there's definitely an issue with it there somewhere. Thanks! – Mike Dixon Oct 28 '19 at 11:45
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While this could be a Lightroom Classic bug, there is a way to "fix" it.

In the Develop Module, go to Lens Corrections, change the lens profile to Adobe (Canon EF 17-40mm f/4 L USM), then select Save New lens profile defaults from the Setup combobox located below the Enable Profile Corrections checkbox. Newly imported photos taken with that lens should now default to that.

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  • Follow-up: Adobe is now aware of this "bug" and is going to look into it. – Mike Dixon Nov 6 '19 at 14:20
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The reason there is a separate profile is because prior to the 1D X series, Canon's 1D series were 1.3X APS-H cameras that had a different field of view from either their full frame 1Ds and 5D series or their APS-C 1.6X crop bodies when using the same lens(es). Adobe should more properly label it something such as [EF 17-40mm f/4 L (1.3X APS-H)].

While Adobe products seem to natively adjust lens profiles for the difference between FF and APS-C cameras, there doesn't seem to be any automatic (unseen to the end user) provision to do so with images from APS-H camera bodies. Thus the end user is given the option to do it manually. As to why Adobe seems to identify your EOS 80D and 77D bodies as 1.3X APS-H instead of 1.6X APS-C when using this one particular lens, only Adobe can answer that. My guess is that there is a bug in the Adobe code for that lens' correction profile that has never been brought to Adobe's attention.

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