# Trioplan 100mm f/2.8

- Brand: Meyer-Optik Goerlitz (DDR)
- Mount: M42
- Focal length: 100mm
- Max aperture: f/2.8
- Optics: 3 elements / 3 groups
- Min focus: 1.1 m
- Filter thread: 49mm
- Production: c. 1955-1970s

Three elements and the soap-bubble bokeh that made it a cult object decades after production ended. Condition varies wildly; the triplet forgives nothing misaligned.

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Source: ShutterFile (https://shutterfile.com/m42/trioplan-100-2-8/). Production dates are catalog-era approximations (c. = circa); independent reference, not affiliated with any manufacturer.