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"reverse hybrid" printing

Having done thousands of copy negatives of prints of all sizes, the best set up was using a view camera on a tripod, holding the print on a metal board with magnetic strips, and studio stobes set at 45 degree angles.

Most of the time, would use a roll film back making 6x9 negatives, occasionally a 4x5 negative if restoration was needed.

Your Mamaya 645 should work fine. I always used a slow film.