I think you're right about the bellows impinging. As for the edges, I provided some mis-direction there. The original image was taken using a digicam with the negtive on a lightbox - there's some light-rolloff along the one edge. On the left edge of the photo shown, which is the end of travel for the Speed Graphic shutter (perhaps some more info would have helped you), which was set at 1/30, it hung up slightly so that edge was over-exposed. That problem does not repeat on the thin negatives which were shot at 1/100s. However, the bellows are there in all 4 frames. The lens, for completing the description of equipment, was a cdv/petzval, the testing of which was the purpose of this exercise - you can see the vignette in the corners.