Im not sure if it was to cold or if I was because I was shooting long exposures (>60 seconds) but I had several instances of film with two slightly offset exposures while shooting some 4x10 images in West Virginia last week. I'm assuming the problem to be the film starting out flat in the holder and then buckling outwards slightly part way through the exposure in the absence of a darkslide to hold it flat. I typically shoot multiple sheets of each image so I know focus wasn't the problem as I did get some good images on other sheets from the shoot-that didnt buckle during the exposure. I also know that the camera didnt get bumped or blown as there was no wind and I pay pretty close attention to these things during the exposure-besides, the final product looked like two images composed, slightly off from each other. With my lack of a vacuum-back, Im wondering if there is a procedure to deal with this- ie does anyone have a set amount of time to allow film to equilibrate in the holder prior to opening the shutter? If so, how long does one usually wait?
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