I have a couple of very old 9x12 cm folding plate cameras (about 50 years old) w ith good shutters, excellent lenses (Zeiss Tessar) and broken diaphragm blades. It is reasonable to sobstitute the internal diaphragm with a black cardboard dis k placed in front of the first lens (like a filter) and cutting a calibrate hole in it? It's the shape of the hole (round or square) important? I did some trial with a square hole simulating about f/20, and the result is rather good. Perhap s somebody could suggest me some better advice. Thanks a lot. Franco
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