I am interested in using pre-exposure in order to control the overall contrast r ange of a 4x5 negative, and I want to check that my logic is correct......if the Zone V exposure is, say, f32 @ 1/15s, does that mean that a Zone 2 pre-exposure is f32 @ 1/125s? Could I effectively achieve this by using an 8x neutral densit y filter, with some plexiglass to diffuse the light evenly across the film?
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