# Super-Macro-Takumar 50mm f/4

- Brand: Asahi Pentax
- Mount: M42
- Focal length: 50mm
- Max aperture: f/4
- Optics: 4 elements / 3 groups
- Min focus: 0.234 m
- Filter thread: 49mm
- Production: c. 1964-1971
- Thoriated glass: reported (mildly radioactive; yellows with age; UV exposure largely reverses the cast)

True 1:1 macro without accessories, in 1964. The flat-field standard that made the Spotmatic a scientific instrument as much as a camera.

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Source: ShutterFile (https://shutterfile.com/m42/super-macro-takumar-50-4/). Production dates are catalog-era approximations (c. = circa); independent reference, not affiliated with any manufacturer.