I have a stash of Efke 25, 4x5. I mostly use it with my old Petzvals. There will be some Civil War re-enactor guys this weekend that I want to photo using an 1862 Voigtlander. I'll use my hand in a glove as the "shutter." I generally have to use about 5 stops or so of ND filters to get exposure times slow enough. How low can I rate the Efke film and still get good results? I'm trying to eliminate some ND filters (I usually have to stack two, maybe three.)
Kent in SD
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