P: Lens Correction Profile for Canon RF24-240 exhibits edge artifacts.

First time post so I hope I am doing this correctly. I am running the latest version of Lr Classic and have a Canon R6 with firmware 1.3.1.  As of 9/15/2021 I started to get a weird border around a lot of my photos.  Please see attached photo.

It appears to be similar to an issue that was reported back in 2017 when Canon introduced the GX camera and it turned out it was an Adobe problem.  Could this be a similar issue? Any thoughts on the best way to proceed? - down rev LR to the previous version?  The issue does not seem to show up in Canon DPP.

Thanks.

Two lens profiles for my Canon RF 24-240mm lens in both ACR and LR.  The first profiles seems to work correctly as does the second labled v2 in LR.  In ACR however the edges of the images are smeared when applying the v2 profile.

Yes - I found the other profile: problem solved - thanks!

Thanks Ian. That solved the problem. 

Recently I have "artifacts in Lightroom Classic on imported raw photos. They appear as a "frame" of lines  - see example on a photo imported into LR compared with the photo when viewed from the computor drive catalogue. Why and how to fix this bug? 

LR version 10.4   Camera Raw 13.4

/ ERNST

I have a 24-240 mm Canon lens, which needs considerable optical correction. Camera Raw has the profile, but applying it causes streaks at the edge of the frame. This first screenshot is the top right corner of the image before profile correction:

 After profile correction, streaks can be seen.

 The odd thing is that I have had the lens for some time, but I don't recall seeing these streaks until recently. I can, of course, simply crop the edge of the frame, but is this a problem with the lens or with Camera Raw (13.4.0.872)? Or have I inadvertently altered a setting? (Using Mac OS Mojave 10.14.6; Bridge 11.1.1.185)

Same behaviorn happened to me yesterday: Apple MacBook Pro M1, Lightroom Classis 10.4, Canon R6. During import LR applies provile v2 and the problem apperas, I changed to "no profile version", synced on all images and everything is ok

Ian,

Thanks for the workaround tip in the other thread.  Buy changing the default to the previous profile we have a "transparent" workaround where we don't need to add an extra step to our regular workflow, but simply do this one-time setup.  We just need to remember to revisit this when the next LrC update comes along.

As an FYI, here was my experience, with as much detail as I can recall:

I had the same issue on my system.  I discovered it yesterday.  I was using the Canon EOS RP with the RF 24-240mm, both with the latest firmware:

EOS RP: FW 1.6.0

RF 24-240mm : FW 1.0.6

I made the import from an SD card.  In the same import, I also had some images with the Sigma 150-600mm C.  The 150-600mm had no issues, the 24-240mm had the problems with the border.  Odd.  If anything I would expect an adapted third-party less to experience issues and not the native RF canon lens.  I had jpegs as well and they were fine.  I was able to open the .CR3 files in Canon's Digital Photo Professional with no issues.

I then tested the RP with a few more lenses: RF 35mm f/1.8, RF 50mm f/1.8, RF 24-105 f/4 and Sigma 135mm f/1.8.  None of the lenses exhibited any issue.   

The next step I took was to use the R5 (FW 1.4.0) with the 24-240mm (FW 1.0.6).  This time the import was from a CFExpress card.  Again the same issue, though the distortion on the borders was less pronounced.  No other lenses on the R5 (my main camera) have issues as I use it very frequently.   

I know I had successfully shot with the RP + 24-240mm combo a couple of weeks ago.  I did not update any FW, so it must have been an LrC update.  Since it was specific to this lens, I went to check the lens profile correction (which I automatically apply during import).  I toggled it off and sure enough the issues in the borders disappeared.  However, I was then left with the lens distortion :(.   I kept examining and when I clicked on the profile drop down, I noticed that I was using the v2 lens profile and there was a "unversioned" (we might call it v1) option.  I switched ot that one and voila!  All was good.

Next step was to figure out how this happened.  Did I somehow corrept the profile generating this v2 or was this an updated profile for a new FW vesion for the lens.  My biggest concern is that I was somehow corrupting my system and this might start happening with other lens profiles.  I checked lens FW version and it was the latest, released in the summer of last year, so that wasn't it.  So I either generated a corrupted version of the profile, perhaps through one of my plugins or it was something wrong with the latest LrC update.   

I went searching the web and found this and the other thread you mentioned above, so I know it isn't something specific to my system/setup and most likely some issue with the latest LrC update.

I'm still not clear if Adobe release an updated version of the lens profile to improve performance, but ended up having a bug in it or if the v2 profile was automatically system generated because of some issue during the LrC update process.  Or something else. 

At any rate, the workaround seems to completely solve the problem for now, and the issue seems to be isolated to this one lens.