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Pentax Thread Size
Anyone would know what the thread size is in the front cell of the lens? I'm trying to get a compression ring from whatever this thread size is to M48 so I can screw in a Baader filter. The ID is approx 51.20mm.
The lens is a SMC Pentax - M 200mm F1:4. I've posted on the Pentax forums but I thought I'd try my luck here too. Thanks for any pointers.
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