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Dad Photographer
Nowadays you can easily find camera/lens adapters for almost any mounts. I used to use the (excellent) Pentax 85mm/1.8 M42 with an adapter on a Canon FD camera. There is a Canon FD Adapter B by which an FD lens (or modified M42 lens) could be mounted on an LTM camera, or use also a LTM-M adapter to use the M42 mount lens on any M camera.