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]

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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.

[bolofoto]

I was using HSS flash. This is not a high speed sync flash issue. That image stripe on the edge is there whether its 1/300 or 1/800 which were most of my shots. The sync issue would be MUCH more prononced and in different location based on shutter speed.

Also, as I mentioned, its not there in mechanical shutter. 

[Waddizzle]

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@bolofoto wrote:

I was using HSS flash. This is not a high speed sync flash issue. That image stripe on the edge is there whether its 1/300 or 1/800 which were most of my shots. The sync issue would be MUCH more prononced and in different location based on shutter speed.

Also, as I mentioned, its not there in mechanical shutter. 

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Exactly.  Use the mechanical shutter.  What's the point of using salient shutter with flashes and strobes popping off?