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Question about doing double exposures manually on slrs (minolta srt 101 in my case):
I know that you have to advance the lever while holding the film with the rewind knob and pressing the rewind button to be able to take a second exposure, however doesn't the act of tightening the film with the rewind knob slightly displace the frame position so that the second exposure doesn't exactly line up?
Also do I need to give each exposure only half the amount of light I normally would?
