>>3155343I had a similar issue with one of my cameras, which may or may not be what's happening to you. I had a black swath across the same corner on a number of frames on a roll (pic related).
Turned out to be a piece of fabric inside the camera (between the shutter and the lens) that would come loose and hang down into the light. Take the lens off and see if there is anything hanging down.
It wasn't on every frame though, it would somehow reattach itself? Never ended up fixing it.
