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Author Message   Wonloo Tinkerer Username: Wonloo Post Number: 3 Registered: 07-2010 Rating: N/A Votes: 0 Posted on Tuesday, July 20, 2010 - 04:14 am:    Grevscale is right, light leak. I had the same problem as you have, horizontal uneven exposure on some of the pictures but not the whole role. It has nothing to do with the shutter speed itself but higher speed indicates stronger light when you took the picture which is more likely to cause light leak. I hope this help.