Yesterday I developed 6 negatives in BTZS tubes. I used a relatively new 11x14 frame dark-bag so I had room to switch the caps.
2 of my negatives were perfect, 4 had a square-shaped over large centrally located over exposure spot covering most of the negative. The only thing that makes sense to me is I could have a major light leak in my traditional Sinar bellows. All summer I’ve used only the double bag bellows and I think I’d switched back to traditional for a bunch of these shots. I haven’t done any light leak testing but I was curious if this shape of over exposure marking had any recognizable characteristic clues recognizable by more seasoned analog photographers?

Many thanks!


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