I just got back from a trip to San Francisco and I was very surprised with what came back from the lab. At first I thought these were light-leaks, but when I finally saw the negatives, I realized that there were perfect parabolae imprinted on two rolls of my film. I can see them from the first two frames I advanced, and then vaguely (or not so vaguely as the links to the images will show) throughout the roll. At first I thought it might be scanning, but these weird parabolae are perfectly continuous. - I was using different lenses, so I know that's not it. - Meter is working fine (Zeiss Ikon). - Pressure plate is straight - Both were ISO 400 - the shots below are TMAX 400 pushed two EV. The other roll was Legacy Pro 400 (shot at box speed). The parabolae are on different parts of the film. The ones below go right through the middle, the ones I am not posting are close to the top. - They went through carry-on X-ray scanners twice (there and back). I know this is the easiest explanation, but seems hard to believe. Any thoughts? http://corposant.smugmug.com/North-America/San-Francisco/Alcatraz/i-SNK2KpP/0/L/000012070026-L.jpg http://corposant.smugmug.com/North-America/San-Francisco/Alcatraz/i-4cXmjSb/0/L/000012070027-L.jpg http://corposant.smugmug.com/North-America/San-Francisco/Alcatraz/i-7kvtHNF/0/L/000012070010-L.jpg Granted these aren't keepers, but I find it really irritating that I don't know what is causing this to happen. My ISO 100 shots are fine.