I have a question regarding minimum lens aperture on my Arca 6x9, IBm currently using a 6x7 film back. I have seen numerous comments regarding lens diffractio n while using an aperture smaller than the so-called ideal for the format. I am using two different Schneider lenses on this camera, a 58mm Super-Angulon XL and a 150mm APO-Symmar. I have read that the optimum aperture for 6x7 is f11 and f 11Bf16 for 6x9. I have conducted preliminary film tests with this camera and e xposed several scenes at f11, f16, and f22 each. Upon examination on the light table I have found that my 6x7 black and white negatives exposed at f22 seem to have the best overall image quality and depth of field, not that either the f11 or f16 is bad mind you. It might just be that the increased depth of field at f 22 appeals to me. How will lens diffraction make its presence know? I might al ready be experiencing it, and just not know it. But if I am it seems a minor pr ice to pay for the added depth of field. Thanks.
Bob P.
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