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.
Pentax Spotmatic
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The Pentax Spotmatic, originally marked the Asahi Pentax Spotmatic, refers to a family of 35mm single-lens reflex cameras manufactured by the Asahi Optical Co. Ltd., later known as Pentax Corporation,
M42 lens mount
…users found it was possible, with longer exposure times, to release the shutter button and open the aperture before the shutter had closed. The bar on Pentax Spotmatic cameras is operated by spring pressure with timing linked to the shutter, but these cameras also had a separate switch for the light meter circuit which…
Asahi Pentax Spotmatic
Honeywell Spotmatic SP face view
Honeywell Spotmatic SP top view
Honeywell Spotmatic SP side view