P: Profile for Canon RF 24- 105mm F2.8 L IS USM Z has edge artifacts

[NYNC]

Just aquired newly released Canon RF24-105mm F2.8 IS USM Z lens. A profile for correction for this lens is on the list of lenses added in December 2023.  Applying the Distortion Correction profile in LR Classic and Photoshop Camera Raw produces edge artifact instead of improving distortion. At the edges, the image shows a pattern of stripes perpendicular to the edge and extending about 5% inward. This artifact occurs in LR 13.1 and Photoshop 25.3.1 with Camera Raw 16.1. It disappears if I deselect Profile Corrections. It is not present when I view the image with other software like the Windows photo viewer FastPictureViewer or in Canon's Digital Photo Professional, so it's specific to LR Classic or Camera Raw 16.1 with Distortion Correction turned on and not due to a problem with the CR3 raw files. If I force use of a profile for a different lens, the artifact disappears. That is perhaps a useful verification that the native profile is bad, but using a mismatched profile isn't going to fix distortion. Turning off GPU acceleration has no effect. See attached JPG screenshot. I'll post in Windows forum but suspect the issue is not limited to Windows.

[Visceral-Image]

Did you even read through this thread at all? I even shared the current work around directly above your post. The pinned comment shows that Adobe is aware of the issue since December 16th and we are just waiting for them to fix it. In the meantime - click "Constrain to Crop" check box found in various locations like "CROP" "TRANSFORM" and the manual secontion of "LENS CORRECTIONS".

[davidr79950732]

No, I didn't read the thread at all. I'm brand new to the forum. I made my post as a new thread, but somehow it got tacked onto this thread. Anyhow, I'm glad Adobe is aware of the issue and is working on a fix. Your constrain crop idea is a smart work around, but slicing off the edges of my pics ruins the composition of some of them. 

[Visceral-Image]

Ah! Well welcome, that happens from time-to-time. In the future, you can search for topics to see if anyone has discussed them before and possibly find a solution to the issues you have. With that said, the work around shouldn't have any impact on the compostion as it's only cleaning up the messy correction that the Lightroom/Adobe profile has created. So it should only be cutting off the area of the odd, rectangular distortion artifacts you noticed. Key word is that it SHOULD only cut off that area. This lens sees much more in the peripherie than what you saw in your viewfinder when you framed the shot. So hopefully it cleans up nicely. I know that this has been working for me without any issue or composition changes.

[NYNC]

Adobe has updated the Lens Distortion profile in the free-standing Camera Raw used by Photoshop, but users are still awaiting a LR Classic update in which the built-in Camera Raw (Develop Module) has been updated with the new Lens Distortion profile. So, you could bypass LR & open the RAW file directly into Photoshop, There, make any edits that you would ordinarily do in LR using Photoshop's Camera Raw, save file as a TIF and import into LR. This allows you to use the new Lens Distortion profile. Another workaround is simply to toggle the Lens Distortion profile in LR Classic to Off. The edge banding artifact disappears. The uncorrected image looks fine, IMHO.. 

[Rikk Flohr: Photography]

Greetings all,

Updates for the Adobe Photography Products have been released.  The February 2024 updates contain an update for this issue. 

If you do not see the update in your Creative Cloud Application, you can refresh it by hitting [Ctrl/Cmd]+[Alt/Opt]+[ R ].

Note: It may take up to 24 hours for your update to be available in your Creative Cloud app.

Thank you for being so patient.

[kgajriaboston]

Hi Rikk,

I have updated ACR but I am still seeing a problem with this lens profile on the longer focal lengths. There are two possible issues and I am not sure of why one appears vs. the other. The first is that when correcting the pincushion distortion the edges generate false data that is of a similar color to what the sensor is capturing on adjacent pixels. The other is that it the edges generate "blank" or "empty" pixels with the white and grey checkerboard look. I have a screenshot example of each. I set the distortion correction to 200% to exagerrate the issue so you can clearly see what is happening. It is STILL present at 100% correction. I have tried this on both my Windows machine and MacBook Pro and the results are the same.

New pixels along edges (see red arrows)Checkerboard pattern, blank pixels

[Chris Castleberry]

Please double-check that the "v2" version of the profile is applied in the Profile drop down menu.

[NYNC]

Just checked. Both profiles appear in February 2024's updated LR Classic 13.2 Develop module (Camera Raw 16.2). If I use the original profile, the edge artifact persists. If I switch to V2, the artifact disappears. The image I used is one imported before the update. The old profile had already been assigned automatically by LR. Does anyone know which profile is automatically selected now when a new RAW file is imported? Will it get the old (buggy) version or the fixed V2? If the former, will users have to manually switch to V2? That would be a time-consuming chore after a big shoot. The profiles are small files in C:\Program Files\Adobe\Adobe Lightroom Classic\Resources\LensProfiles\1.0\Canon. Any reason why users shouldn't just delete the buggy profile to avoid it being assigned going forward? Will LR crash if the buggy profile previously assigned to an old RAW capture has been deleted? As a corollary, can users delete all the profiles for lenses for cameras they're never going to own to free up laptop drive space?

[Robert30334126tama]

>  Does anyone know which profile is automatically selected now when a new RAW file is imported? Will it get the old (buggy) version or the fixed V2?

I was concerned about this as well, but I just tested with some new photos and Lightroom picks the V2 profile correctly. Yay!

[kgajriaboston]

Thanks, that makes a big difference. No more edge artifacts, though some of the corrections look off ie 100% correction creates strong barrel distortion. I need to do more testing.

[Chris Castleberry]

Correct, by default, any newly imported images and images without committed edits will pick the "v2" profile. I think Lightroom may apply some settings by default (don't recall exactly), so any images imported prior to the availability of the "v2" profile may the the "v1" profile applied. The general idea behind a "v2" or later profile is to provide a new profile for default settings while not disturbing images with existing edits/settings.

I do not recommend deleting any of the existing lens profiles. The next update will likely reinstall them anyway. You can update existing images to use the "v2" profile by applying it to one image, copying the Optics Edit settings (Lens Profile Corrections at a minimum) from that image, and then pasting those Edit settings onto images that you wish to replace the selected lens profile.