Dark vignette appearing on one side of pics taken with Canon R6 when using studio strobes

[Radison]

I'm having a problem with vignette/banding on one side of my pics when using studio strobes. At first I thought this might be caused by exceeding the shutter speed max resulting in banding from the curtain but the attached samples were all shot at 1/160 which is well within the 1/250 max for my Canon R6 when using studio strobes (Alien Bees). These were shot at 100ISO, 58mm, f6.3 using my Canon 24-70 f2.8 L lens. The strobes are set up either side of me at the same distance on the same power level

This seems to keep happening when I do studio shoots and I would really appreciate any thoughts on how to fix the issue. Thanks a lot!

Vignette is at the bottomVignette is on the leftVignette is on the left

[Radison]

Thank you for your input, I really appreciate it. It seems to occur each time I work with strobes in a studio. I don't notice the issue for outdoor shoots. In the studios I use they generally have some natural light from a skylight or windows which is consistent rather than flickering. Does that give you any ideas?

[Radison]

Yes, that's a great observation. I check other pics and they a more perpendicular and the vignette is still present. But I will definitely keep a look out for this in future.

[ebiggs1]

I just got through with a 100+ photo shoot on a green screen and saw similar situation. In my case it was to delete the BG so no biggie. PS took care of it for me.

[Radison]

I see. Ok, thank you. In my case I think I will need an alternative solution than replacing the background on hundreds of pics. Hopefully someone else will have other ideas we can both try. Fingers crossed!

[ebiggs1]

In my case I needed to replace the BG and use this one.

The student is removed from the BG and placed in this to make a 24"x36" poster on canvas.

I have done this for years so it has  become a simple set of procedures for me. I used a green screen but I do not recommend it. A neutral gray like yours is prefered. Also it was a fabric screen and I don't like that either because there is invariably variations in it. I was not at my own facility but you do what you have to do. That's a photographer's life isn't it?  🤔

[sherrysaifullah]

Hi! I'm having the same issue and the shadow shifts as I rotate the camera. Did you ever figure out what was wrong?

[amfoto1]

It's quite possible the 1/160 shutter speed you are using is a little too fast. Try a little slower.

Most studio strobes fire slower than portable flash, so slower shutter speeds are necessary. It varies depending upon the particular strobes. With my Normans I can use 1/160 on cameras that sync flash at 1/200 and 1/180 on those that sync up to 1/250. However, that's no guarantee the same is true with your strobes. To me it looks like the 1/160 you're using is just a tiny bit too slow. Anyway, it's easy to try and see if 1/125 solves the problem.

***********

Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7DII (x2), 7D(x2), EOS M5, some other cameras, various lenses & accessories
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[rs-eos]

It would be better to start a separate topic as this original one is a year old now.  Also, please post a couple images so we can see exactly what is going on.