Canon R5, light leakage? Brighter exposure on the edge of my photos

[bolofoto]

There seems to be a bright overexposure running along one edge of my photos, seems to be the bottom of the censor maybe. Anyone else experience this? I am using a Canon EF adaptor and a Sigma 35mm lens. 

[Ray-uk]

You really need to post a picture so that we can see this. If it is appearing at the bottom of the picture then it is at the top of the sensor.

Does it happen with a standard Canon lens, some adaptors can suffer from internal reflections that cause bright spots.

[bolofoto]

Here are some photos, not sure if its ok to post them here.

[Waddizzle]

Which edge is overexposed?

[bolofoto]

The bottom or the right side when camera is rotated. You can see that bright strip.

[Waddizzle]

Are you using any strobes or flash?  Were you using the silent shutter?  If the answers are "no and no", then you need to contact Canon Support.

[bolofoto]

Yes, I was using off camera flash, but no to the silent shutter. 1st Curtain electronic.

Edit: Confirmed, this happens when using Electronic or 1st Curtain electronic. Not mechanical shutter. I also noticed it happens when the shutter speed is above 1/250th of a second. At 1/200th I do not see it.

[bolofoto]

So can anyone tell me if this is a problem with the sensor or is it because of a Sigma Lens and Canon EF Adapter? I never had this problem with my Canon 90D. Thanks in advance.

[Waddizzle]

I think if you stop using the silent shutter with the flash/strobe, then the issue just may go away.

[Ray-uk]

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@bolofoto wrote:

Yes, I was using off camera flash, but no to the silent shutter. 1st Curtain electronic.

Edit: Confirmed, this happens when using Electronic or 1st Curtain electronic. Not mechanical shutter. I also noticed it happens when the shutter speed is above 1/250th of a second. At 1/200th I do not see it.

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Read your manual, maximum sync speed for electronic shutter is 1/250, for mechanical shutter it is 1/200. If you want to use higher shutter speeds then you need to use HSS flash but that opens another can of worms.