topic Re: Odd distortion on edges of frame in EF & RF Lenses

RF 24-240mm Odd distortion on edges of frame

thedigitaldog — Wed, 02 Oct 2024 16:57:32 GMT

Can anyone tell me the case of this and how to make it stop? It is intermittent, not all images. Lens is a Canon 24-240. TIA

See edges

Re: Odd distortion on edges of frame

thedigitaldog — Wed, 02 Oct 2024 16:25:04 GMT

Sorry, this camera body is a EOS R6 Mark II.

Re: Odd distortion on edges of frame

Tronhard — Wed, 02 Oct 2024 16:51:57 GMT

Are you by any chance viewing this in Lightroom or Photoshop? I had the same issue, but not when I looked at the same images in my windows Photo app. Apparently, it is a glitch with Adobe and they have worked on an fix because in my latest update it isn't showing any more. I suspect it is an issue with the algorithms used for lens correction data in those programs - so it's either their algorithm or the one supplied by Canon, but it seems to have been cleared up in my software.

Re: Odd distortion on edges of frame

thedigitaldog — Wed, 02 Oct 2024 16:55:51 GMT

Yes, the latest version of Lightroom Classic on Mac. And yes, you're onto something; I don't see this when viewing the DNG using RawDigger; it isn't there! That's a relief. I'll contact Adobe (I'm a pre-release tester). Thanks!

Re: Odd distortion on edges of frame

thedigitaldog — Wed, 02 Oct 2024 17:00:00 GMT

OK, its a bug only in Lightroom Classic, using the 24-240 lens profile. Not an issue using Adobe Camera Raw with the same profile. I'll let Adobe know something is wonky with the profile in Lightroom Classic and super happy to know, the raw data is fine. Thank you!

Re: Odd distortion on edges of frame

Tronhard — Wed, 02 Oct 2024 17:26:25 GMT

No worries, glad you are sorted.

Re: RF 24-240mm Odd distortion on edges of frame

Peter — Wed, 02 Oct 2024 19:52:07 GMT

Adobe already knows https://community.usa.canon.com/t5/EF-RF-Lenses/RF-24-240mm-F4-6-3-IS-USM-Blurred-Edges-on-Multiple-Cameras/m-p/502414

Change AutoScale from false to true in the XML file.

As you can see here I can create the same "issue" if I change the scale in darktable https://community.usa.canon.com/t5/EF-RF-Lenses/Canon-RF-24-105-2-8-weird-edge-stretch-issues-when-zoomed-in/m-p/455758/highlight/true#M29362