I shot a few rolls on Minolta XG-M with different lenses and some images have an underexposed edge. It take a while for me to go through a roll, to the point of me forgetting which lens/settings I used, but looking through the images, I'm fairly confident that
- The shaded region appears on the same side.
- It only appears when using my 70-210mm Vivitar.
That pretty much rules out shutter problems, I guess? Could it be the lack of a lens hood?
Here are some examples:
EDIT: Apologies for the mistake, the lens is Sigma Zoom-k II f/4.5 70-210mm Multi Coated Lens. Other lenses I use are Minolta MD 50mm f/1.7 and Minolta MD Zoom 24-35mm f/3.5, which don't seem to have this problem (from what I remember about the images taken). The zoom lens has some internal dust, but otherwise looks fine. Not sure how to test for thhe interaction between the aperture and a mirror. Also, I scan with a DSLR+zoom reverser, so had to improvise with these images, but the same shade doesn't seem to overlap with two frames: