Originally Posted by
Pat Kearns
Modern film holders will work but there will be about a 1/8" focus shift compared to the plate holders. My brother-in-law built a spacer out of plexiglass that I insert when focusing then remove and insert the modern film holder for exposure. I have a ROC Pony Premo No. 3 that is a 5x7.
A forum member sent me the following information on the aperture markings. It might help you from burning up a lot of film.
Pat -- the aperture may be marked in the old U. S. numbers, where 8 = f/11, 16 = f/16, 32 = f/22, 64 = f/32, and 128 = f/45. If it is marked thus, the aperture at number 8 should appear to be about 3/4 inch when viewed through the front lens cell from a distance, and at number 128, about 3/16 inch. At the modern f/8 number, the diameter should appear to be about one inch, and at f/128, about 1/16 inch.
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