Known Participant

Question

Lens profile correction for Canon RF 100-500L makes result worse

Forum|Forum|3 years ago
March 31, 2022
4 replies
2085 views

Hi team,

first off, English is not my mother tongue plus I also use the German version of LrC and CR, but I hope to get better help here in the English forum.

I was sent over here from another thread in the LrC Forum, where I started this discussion:

https://community.adobe.com/t5/lightroom-classic-discussions/vignetting-profile-correction-for-canon-rf100-500-makes-it-even-worse/m-p/12845779

I really hope this is the right subforum, its not really a bug, more a report of a lens profile that need attention.

I have recently gotten a new Camera and Lens, and have big trouble correcting vignetting caused by my lens. When I apply the automatically suggested correct profile for my lens, I surely can see a difference, but looking into detail the result gets worse than before.

My goal is to help adjusting/fixing the existing lens profile used by CR and LrC with my examples.

I am using LrC 11.2 with CR 14.2. Windows 10 Home 21H2 19044.1586

My Camera is Canon EOS R5 with the lens Canon RF 100-500L. All my pictures are RAW and full frame.

To make vignetting and possible sensor dust spots visible, I use the equalize tool of PS temporarly. It is not part of my editing routine, but I will show some example pictures here in equalized, to make the vignetting visible.

Biggest problem is, when the lens profile that comes with CR and LrC is applied, the dark corners are slightly corrected, but a new dark area in the middle of the picture appears. The more I adjust the sliders for manually vignetting correction, eighter the corners or the middle gets darker. I am not able to get a clean sky.

Here are some examples of uncorrected and corrected pictures I took. Equalized, only to show the vignetting better.

EXIF 1/640s, f7.1, ISO100, 400mm
original file without lens correction

corrected file using the lens profile

EXIF 1/640s, f7.1, ISO100, 400mm
original file without lens correction

corrected file using the lens profile

EXIF 1/640s, f8, ISO160, 500mm
original file without lens correction

corrected file using the lens profile

I will provide some links to these 3 RAW images, so hopefully someone can replicate the issue.

https://www.dropbox.com/s/mev2cg3ztxy56po/R05_0423.CR3?dl=0

https://www.dropbox.com/s/pxhu4376stsculf/R05_0183.CR3?dl=0

https://www.dropbox.com/s/cx3euriorkb47p2/R05_0047.CR3?dl=0

Thank you very much for any support.

This topic has been closed for replies.

deejjjaaaa

Inspiring

dear, I finally downloaded your raw files and used Iridient C-Transformer (which can extract optics correction data that Canon puts in CR3 raw files)... no ill effects with vignetting

https://postimg.cc/gallery/XNh9qtd

PS: do note that I do not have any Adobe lens profiles installed - so ACR was not by error using Adobe profiles over optics correction data that Iridient C-Transforner put in DNG file before feeding to ACR

K

kampfhase1106Author

Known Participant

@deejjjaaaa , please hear me.

I downloaded one of your result, there still is vignetting even with your edit.

Yes, it may be nitpicking, as I said 100 times before, but it still is there. It was not there with my older lenses. The profiles for the 100-400L MkII were on point, at all focal lengths, at all apertures. After I did apply the lens profile for this lens there was no vignetting visible, even on the strong exaggerated contrast versions like this.

I registered here in the Adobe forum because I needed help with Adobe products I use and pay a monthly fee for. I need help with a lens profile used by Lightroom Classic, which I used for centuries and was always doing it's job 100% on point. Now with the new lens and the new profile it doesn't, so I seeked for help here.

All I can hear, use this tool, use that tool instead. Yes I tried them, and as you can see, even if you use them they don't work and do not eliminate the vignetting completely.

So I am offering my help here, with some RAW files the developers could use, to hopefully get help in an updated lens profile. For LrC / CR please, the tools I like to use and pay for, that's why I am asking here and not in the forum of any other developer.

Yes, I have learned for the future to not use the apertures again when I have such a sunny plain sky, and I already have gotten better results with f11, which are corrected fine with the lens profile. But as said before, with other lenses I used before even the wide f4.5 or f5.6 pictures of such plain sky were corrected perfectly.

deejjjaaaa

Inspiring

no it is not -- you are what is called in English - "splitting hairs" = trying to find an artifical way to show something that is not seen in any normal raw conversion or postprocessing... unless of course you specifically want to use PS Equalize as the end result of your work to artificially blow vignetting "in your face"... you raw files turns out have prob 2/3 stop vignetting for a start (that is a frame corner is __ONLY__ 2/3 EV less exposed than the middle of the frame - it is nothing to talk about even w/o any correction) ... even if you do not try to fix it at all it is not visible... I was under impression that you are tying to fix some serious vignetting like 2-3 stops difference... so give it a rest

L

Lumigraphics

Legend

How do these look in Canon DPP?

K

kampfhase1106Author

Known Participant

Nearly exactly the same, plus I do not use DPP for my editing workflow. LrC is way better IMHO.

L

Lumigraphics

Legend

You are aware that vignetting varies with your aperture and sometimes focal length? And also sometimes if you use a filter or lens hood? A profile can't always get vignetting correction right. If the files look the same in DPP, then you might just be stuck.

floramc

Community Expert

I use different lenses and I must admit I am not always satisfied with the results, so I do not completely rely on it.

There is a lens correction filter in ps too, although I admit I find it is not ideal for my workflow.

As to vignetting, does it give such a bad result, or does it imply too much mechanical work to adjust it with the given tool on Camera Raw? Skipping lens correction.

Just curious about your experience.

deejjjaaaa

Inspiring

I am simply using optics correction that Canon itself embedds in CR3 raw files (using Iridient C-Transformer) and I delete all Adobe lens profiles that are installed by default ... works much better for me (your mileage can vary)

K

kampfhase1106Author

Known Participant

Thank you for the suggestion of a new tool, never heard of it before. I tried the demo version of Iridient C-Transformer, and this tool does give similar if not the same results for correcting my vignetting.

K

kampfhase1106Author

Known Participant

I took my camera out today again and took pictures with f10 and f11. All of these work absolutely awesome with the lens profile that comes with Camera RAW / Lightroom Classic. Just a few adjustments needed with the manual sliders and all come out with no visible vignetting.

Now it's just the wider apertures like in my above examples f7.1 that please need a fix of the existing lens profile for the Canon RF 100-500L.

Sign up

To post, reply, or follow discussions, please sign in with your Adobe ID.

Sign in to Adobe Community

To post, reply, or follow discussions, please sign in with your Adobe ID.

Scanning file for viruses.

This file cannot be downloaded