Sir:
I have a 1;4.5 F=75MM rodenstock-ysaron lenses. It is mounted in a Prontor shutter which is labled Polaroid on the bottom. I thought I would try for some macro shots. My problem is that the shutter has no aperature settings. I do have a shutter speed tester. Can I use it to establish my own aperature numbers?
Sincerely,
Jerry
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