I recently used a rental RB67 and in looking at the 120 negatives I have noticed a pattern of two types of probable light leaks across all of the film that I shot (but fortunately only across some images in each roll). As it was a rental I no longer have that camera so the issue can't be fixed, so I'm just looking for a probable cause.
In the first case, there is a dark band covering the numbers along the bottom of the negatives. This only seems to occur on the last 3 or so images on the roll, and curiously this also only seems to occur on one edge of the film.. I suspect that when I removed the film from the camera that I didn't keep the wrapper tight. Is my assumption correct?
The second issue I have noticed is a probable light leak on one corner of some frames. There doesn't seem to be any pattern in which frames have this leak. The only explanation I can come up with is that I was changing lenses and that mirror was not perfectly sealing the film (and I wasn't using the dark slide when changing lenses - is that a bad thing?) But when I look at the images on either side of the affected one, they were all taken with the same lens. This may be explained by me swapping the lens to test the field of view and then going back to what I originally had. So any ideas on this leak?