I recently acquired a large brass lens from a trusted source. It is marked 2A Cervees. It doesn’t have a knob and tread, but the rear element has four markings suggesting turning the element will adjust the degree of softness. Am I correct? Is there some thread to help me figure out how to properly use this lens. I hope to do some experiments but removing and re setting the lens will take almost as much time as waiting for the plate to sensitize. Thanks for any information.
Brent
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