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Dust from film backs getting on film


New Member
I recently acquired a used 503cx that came with two A12 backs and I'm getting many tiny clear spots on the negatives indicative of dust or other fine debris.

I'm used to dealing with dust with sheet film, but this is the first time I've ever had trouble with roll film.

I'm fairly certain the dust is originating from the backs instead of the body because the problem seems worse with one of the two backs.

Even after I cleaned the offending back with compressed air, I still get the spots which ruin the negative.

Does anyone have experience with this?

One thing that I would check is the light traps. I had dirt appear on the darkslide for months prior to the light trap failure.