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Contact sheets have a "maximum" black inconsinstencies throughout the same 35mm roll:

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Rorystreet91

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Dec 26, 2025
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When making a contact sheet, I aim for maximum black using a strip of negative, but often when exposing the whole roll, the exposure time to get the rebate black is not the same for all 6 strips of cut negative.

The ones that are done using my test strip are matching, but others are more exposed or less exposed.

In these cases, do you dodge and burn the entire strip sections that are not equally exposed?

What is the cause of these exposure inconstancies?
 
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