According to the information on the SK Grimes website, Copal 3 shutters have a mounting thread of 62mm, and Copal 3S shutters have a mounting thread of 61mm. I have a lens in a shutter that is marked “Copal 3” that has a mounting thread of 60mm. The lens is a 210 Angulon and the serial number dates it to 1965. Has anyone else encountered a Copal 3 with this smaller mounting thread?
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