EOS R8 Weird dark border + bright patches

[fisherman10]

Hi everyone, would anyone know what would be the cause of these issues. There is a dark band on the top and bottom edges (landscape) or left and right edges (portrait). There is also a bright patch/haze right after the dark band.

I can see the dark band in the viewfinder and the screen before taking the photo. All photos jpg straight out of camera. Using EFCS. NOT electronic shutter. First 3 photos with the lady taken with flash, last 2 photos of the white wall taken without flash.

Canon R8, Canon EF 100mm MACRO USM and Canon EF 24-105 F4, 3rd party EF-R adapter.

To add to that, I also see the same issue on the screen preview and viewfinder BEFORE taking the photo.

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[jrhoffman75]

Is the opening in your adapter rectangular? The one in my Canon brand adapter is. Maybe the sizing is not quite correct and there is an edge effect? 

[kvbarkley]

How long have you had the camera? I suggest you contact Canon. Do you have image corrections turned on?

[fisherman10]

Yup it looks rectangular to me

[fisherman10]

About a few months. Only realised it recently.

I need to check the settings but I don't think it's due to image corrections. I can see the black border at the top and bottom in the preview. Meaning I see it on-screen and in the viewfinder BEFORE I take the photo.

[kvbarkley]

I believe the mirrorless cameras do on-the-fly corrections.

[stevet1]

fisherman10,

Maybe you could try a couple of suggestions while you're using your adapter for the time being:

1) You could try changing your composition a little to account for the border, an then do a little cropping; and/or,

2) switch to a 1:1 aspect ratio and only get what''s in the center of your frame instead of a rectangular 3:2.

Steve Thomas

[jrhoffman75]

Difficult to tell, but the opening in my Canon version appears larger. Does yours have anti-reflect ridges all the way to the RF side opening? Looks like a reflection right at the opening. You might be getting vignetting. 

[ebiggs1]

"...3rd party EF-R adapter."

The oblivious, why don't you get a Canon adapter?

"You might be getting vignetting."

I have no doubt yours is vignetting the image.

[rs-eos]

Since you're using a 3rd-party adapter, that may be the issue.

You could rent a Canon EF to RF adapter (at least at lensrentals, this is around $17 for a single day; taxes/insurance would raise that)

That way you'd know if this is your adapter or some other issue.