Vignetting profile correction for Canon RF100-500 makes it even worse

LR finds my lens automatically, but when I apple the correction, the picture gets even worse with a strong dark area in the middle. Whatever changes I make with the sliders of the correction, it gets worse.

By @kampfhase1106

I don't really understand why you are seeing an issue. You said that after import you applied corrections, what corrections are you meaning: applying the lens profile or appling vignetting corrections manually?

When you import images from the R5, Lr Classic automatically enables the "Remove Chromatic Aberration" and the "Enable Profile Correction" settings in the Lens Corrections panel (I've reported that as a bug a while ago, but it's still happeneing). Obviously the lens profile should automatically correct any lens vignetting, and that's certainly what happens when I import your image into LrC version 11.2. This is how the image looks in the Develop after importing:

And this is how it looks if I disable the Lens Profile:

All of that appears entirely normal behaviour to me, I don't have to touch either of the vignetting sliders (but even if I do push the sliders to either extreme I cannot see anything untoward happening in the centre of the image). So a couple of questions:

1. Are you appling any develop preset during import?

2. Have you set anything other than Adobe Default as the Raw Defaults in the Preferences>Presets tab, or do you have any camera-specific settings specified?

Just some thoughts on the issue you have initiated.

You have purchased a Camera from Canon the manufacturer and they have provided you with software to process the raw image files produced by the camera model which includes profiles to render the raw data and also correction lens profiles needed for the correction of vignetting, chromatic aberration, distortion etc.

You have chosen Adobe Camera Raw / Lightroom Classic software to utilize as an alternative to your camera manufacturer software. So you should first compare if your choice is the one to adopt. Does Adobe offer and provide an improved rendition?

If you are satisfied that is the better option then proceed and utilize the tools available.

Just another thought "out of the box", did you by chance use DxO Photo Lab to apply lens correction.

I have downloaded the image you shared and imported into LrC 11.2 using the Adobe default default develop. Also tried the Landscape profile. The camera lens profile gets applied automatically with remove chromatic aberration.

In all instances the image displayed an acceptable rendition.

What version of Lightdoom Classic are you using? Are using version 11.2 the latest update.

Is it possible for you to share the raw image file via Dropbox or the like, so other users can test to determine if they can test what you are experiencing.

Within Lens Correction, you can switch to Manual and manually correct. I suggest saving the setting as a Preset so that you can easily correct it in the future.

warmly/j

It looks to me that the image has been edited to an extent that clipping appears. Did you shoot in raw?

(unrelated to this: did you see the sensor spot somewhere above the wing?

)