My 5D4 is given a clearly visible dark gradient at the bottom of frames when shot at 1/200th. Completely gone at 1/160th. There was 1 single shot out of about 200 in my last session it caught black and I thought I bumped my shutter speed but I didn’t.
How do I diagnose this?
I am using pocket wizards and photogenic strobes with one on the camera and the other with the phono plug out and into a strobe, then letting the other strobe trigger off that.
I have turned off one strobe, and tested to verify it happens. Then I swapped strobes and tested again with the same issue.
Hooked up the PC Sync cable directly and it’s less, but still there. I probably wouldn’t have caught it in most circumstances with a direct cable, but adjusting contrast shows it’s there for sure.
So am I missing something to test or should I be reaching out to Canon for repair? Still under warranty.