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M42 / Trioplan 100mm f/2.8
SHUTTERFILE REFERENCE DATASHEET · M42 · SF-M42-016
Trioplan 100mm f/2.8
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.
100mmFOCAL LENGTH
f/2.8MAX APERTURE
3e / 3gOPTICS
49mmFILTER
BRANDMeyer-Optik Goerlitz (DDR)
MOUNTM42
PRODUCTIONc. 1955-1970s
MIN FOCUS1.1 m
Before you buy
- Aperture blades: dry and snappy. Oil on the blades is the mount's most common disease and a real repair cost.
- Look through the glass at a light: haze, fungus threads, and balsam separation all announce themselves. Cleaning marks on front coatings matter less than sellers fear.
- Focus ring: smooth, even resistance end to end. Grit or a loose helicoid means a reluble at minimum.
- Thoriated designs yellow with age. A week of indirect UV largely reverses it; factor the cast into what you pay.
- Auto/Manual switch and pin function: the stop-down pin should move freely and the switch should actually stop down.
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Adapters for this mount
M42 adapters for modern mirrorless bodies
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