Hiya,

I have two distinctively different light leaks happening frequently, but not always. I am shooting with a 8x10 Sinar with metering back and plastic fidelity elite holders.
One (as in the b&w example) starts about once cm in from the side with a fairly hard edge, slowly fading out. It occurs on the side of the dark slide insert.
The other one is two fairly sharp edged light lines few mm and about one cm in from the edge with a less exposed area in between. This one occurs on the side of the flap.
Having numbered all holders, I know for sure that either problem is not linked to a specific holder (yet it might be the same fault at several).
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Because of the fairly sharp edges, I'd blame something close to the film. Yet I am not sure where it could happen. I tried a lot but with out success... The light trap at the dark slide entrance? Between camera and holder? Is it handling (wrong inserting of the dark slide, transport, etc)? Any help appreciated!

best,
Claudius