Have got a Rodenstock Rodagon 80mm F4 enlarging lens from B&H. There is a
release button, it makes aperture ring is free instead of stopped by half
stop. What is the function for? Besides, I cannot rotate the aperture ring
to the slowest speed --- F22. It'll stop at F16 position. Although I am
seldom to apply F22 but wish to know why.
Thanks all.
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Michael
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