My 4x5 negatives exhibit a 0.5 inch over exposed strip down the right side (looking from the ground glass side) and the film is loaded horizontally (haven't tried this with the film loaded vertically). It appears to be a light leak resulting in about 2 zones exposure. I do tray processing and I have tried new boxes of film.
My equipment is a Wista cherrywood (1984), Nikkor 120 and Schneider 210 lenses. I have taken the back off, covered the camera and looked through it with a lens mounted. I can detect no light leak with the shutter closed. Do the holders let light leak past the slide entrance as they age? This started about 3 years after I bought the camera and holders.
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