I have this lens in barrel. It has an aperture ring that goes from f:11 to f:90. It has a red dot between Apochromat and Artar. I hope to mount it in a size 3 shutter and or the #4 Acme. It is the longest lens I have at 19 inches. I assume it is a process lens that should be OK at infinity for the 5x7 and 4x10 formats. Any experience with this lens?
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