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Anonymous
>>310233 It's dust on the film during scanning. It's really not hard to keep the camera clean, but the film provides a much larger space to collect dust.
With 35mm and medium format it's pretty easy to keep dust under control during scanning, and it doesn't take too long to touch up any spots that you missed. On the other hand, 4x5 is so huge that it can take ages to spot all the dust that you missed, and it's tougher to keep clean in the first place.
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