Clarification on M mount threads - Zenit

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Kristoff2034 New Member • Posts: 5
Clarification on M mount threads - Zenit

Hello!

I need help. I recently bought a few Zenit bodies for fun (5 for $30!!!). I am having a hard time understanding the M mount system so that I can buy some lenses.

A few places online say 42M and for another camera (the 3M) it takes a ZM 39.

So are ALL M lenses interchangeable and the numbers (42, 44, 50, etc) have something to do with focal distance? Or do the numbers represent something with the threads and therefore have to fit a particular M system?

An example would be a Zenit 12SD saying online that it would have sold new with a 44M lens...but some forums users had talked about a 42M lens. This is where I am getting confused.

These are my first experiences with 35mm cameras. Any help is greatly appreciated!

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