I recently picked up an early 20th century brass lens that seems like a European lens branded with an American photo supply business name. There is no flange with the lens so I need to identify the exact size and pitch of the thread so I now what kind of flange I need. How do I go about doing that?
Specifically I wonder if I just take some calipers and measure the diameter of where the threads are? Wha about identifying the pitch of the threads?
Thanks in advance.
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