I just got a RH-10 Back for my baby Crown, and have tried Velvia and Ilford Pan F. Film flatness is horrible with either, requiring f:32 to achieve sharpness o ver the entire negative (105mm Ektar). Is there any roll film, either B&W or co lor, that works best in this holder? Also, do Mamiya RB-67 holders fit a Graflo ck back, and how good are they for film flatness. TIA Mitch.
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