yes indeed the edges of the rebate are fogged - I've checked the shutter (1930s vintage Compur) and it seems as good as an 80-odd year old leaf shutter can be so I think that rules out banding as a result of the shutter. Awaiting delivery of a newer (still pushing 70-80yrs old) back supposed to be a better match for the Makina II - the existing one appears to be one better matched to the Makina I, though still a good fit on the II. . . the felt light trap between the camera and the back also appears to be in good repair, so it's unlikely to be the source of the issue.