EOS R5 Artifact in Image

[musicmaiden]

I just got a refurbished R5 and when taking it out on the second day, I got this pink band on a couple of images. What could cause that band? 

[musicmaiden]

R5 Pink Band

[kvbarkley]

That looks like a bad sensor. I suggest you send it back to Canon. Do you see it in the viewfinder/back screen on live view?

[musicmaiden]

yes, that is just a shot with my cheap phone camera of the LCD screen.  I was thinking of that as well.... but I discovered since this morning,  that when I look at it in Lightroom, the pink band is in the Preview pic, but when opened up it disappears.  This is the second refurb one I got, the first one went back with intermittent freezing up issues.  Do you know of a procedure to test the sensor? 

Thanks, Karin 

[rs-eos]

Are you capturing in RAW+JPEG? Just wondering if the previews in LR are built from the JPEG?  To help rule out file corruption, how do you have your files saved to cards in the R5? RAW only to the CFexpress card? both cards?

If you have a RAW and potentially a corresponding JPEG image that you could upload to a file sharing service, that would be great.

[musicmaiden]

thank you Ricky! Never used a file sharing service, so let me know which service/site I should go to, I will upload both images.  I typically have Raw on one card and JPEG on another  (R6) but since I just got this R5 I had not separated the images and both went on the CFExpress card. 

[rs-eos]

You could really use any.  One being DropBox.  I believe they have a free version.  You can always delete the files afterwards as needed.

[musicmaiden]

First time, so hopefully it lets you view it : https://www.dropbox.com/scl/fo/v87ih3wvs1li66jv9pnin/h?rlkey=4owt4dyz325oyb9v3yxu0e3aa&dl=0

I am encouraged it may be "just" file corruption....

Thanks, Ricky!!!

[rs-eos · Accepted solution]

Thanks for providing those.  Definitely strange.

In Finder (I use a Mac), the thumnail that was shown for the RAW file does show the pink area.  Same when pressing spacebar to bring up QuickLook.  The JPEG though is a-ok in Finder.

I then imported both images into Lightroom Classic (version 13.1 with Camera Raw 16.1).  Both previews were a-ok.  And bringing up each one in Develop also showed no issues.  I then exported each and both of the exported files had no issues.

Finally, I opened up both the RAW and JPEG in Photoshop.  Same outcome; no issues.

Thus, I'm going to conclude that it's the preview image that is embedded in the RAW file that is bad.   There are definitely experts with RAW images on these forums, so perhaps they'll be able to shed more light on all this.

What you could perhaps start doing is capturing RAW to both of your cards to see if perhaps one card is leading to the issues.  Beyond that, I wouldn't know what could be causing the embedded preview to be bad when the RAW appears OK otherwise, and the captured JPEG is also good.

[kvbarkley]

AFAIK, the preview is simply an embedded jpeg, it is possible that the camera uses the embedded JPEG to view it on the screen as opposed to decoding the RAW.