I recently purchased a 70's-something Canon AE-1 and started experimenting with film. I was using a Kodak Ultramax 400, and took some night shots hand held at 1/30 with a 50mm f1.8 lens. Those shots came out like this (take note of the blue vignetting on one side):
The camera is not in perfect shape (being 40ish years old, working order is already good shape). The light seals of the back cover are destroyed, but anyway the only pictures that have this defect are the dark-ish ones, and both where taken back to back (so the film dind't have time to be damaged by broken light seals, I guess). Daylight pictures does not show this defect. I'm trying to rule out possible causes to prevent this in the future. Some things to consider:
- Film was expired by one month at the moment of taking the pictures (I don't think that this affected it seriously)
- Apparently the only ones that show this defect are the ones taken with the 50mm 1.8.
- I tried night shots with other lenses (but doing long exposures, 1 and 2 secs) and those don't show the defect.
I'm trying to rule out if this is a normal issue with film, or if it's there something damaged on the camera or lens. Or if this has to do with the film ASA.
As requested by @meklarian, I took a picture of the interframe: