M42 lens mount
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The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means t
Auto-Takumar 1:3.5 35mm
M42 adapters exist for many current lens mounts; here, a Pentacon 50mm M42 lens is mounted to a Canon EOS body.
T-mount
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The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 metric thread on the lens with a flange focal distance of 55 mm a
T-mount to M42 mount adapter ring