EOS R5 Mark II Is this horizontal flash banding?

[Cyrilbrd]

Good day,

Experimented with Aperture priority with ISO-800 f/2.8 1/200sec with MF12 and got every single shot during stacking with an horizontal band.
Repeated the same shot with the Program mode as I believed one of my setting was off and got all 10 shots without any band.
I did some research and this is what I understood: 
At 1/200s on the R5 II, I was right at the edge of the camera’s x-sync speed. If the flash duration (in this instance) or the shutter curtains aren’t perfectly aligned, part of the sensor can be exposed unevenly, creating that horizontal band.
In Program mode, the camera automatically selected a shutter speed within safe sync range (1/100sec. with same ISO but f/4), so no banding appeared.
Is this correct?

[deebatman316]

Is that the manual flash version or is that the Canon version which provides E-TTL. 3rd Party flashes are known to cause banding on Canon cameras. You can try the full mechanical shutter. Or try a slower shutter speed to see if it helps. If not you’ll have to look into a new 3rd Party flashes. Or a Canon brand flash to eliminate the problem. 

[Cyrilbrd]

Good day, 
It was a third party flash but the issue was the shutter speed, once adjusted the issue did not duplicate itself.

[p4pictures · Accepted solution]

Focus stacking uses electronic shutter, the sync speed for electronic shutter is 1/180th on the EOS R5 Mark II. It is 1/200th for mechanical and 1/250th for first curtain electronic shutter modes.

[Cyrilbrd]

Understood.