Focus
Manual
Mount
Olympus OM
Format
35mm full frame
Groups
2
Coating
multi-coated
Elements
5
Weight
590g
Filter Thread
72mm
Length mm
97
Spec Notes
The only OM mirror (catadioptric) lens. Fixed f/8 — no diaphragm, so no blade count by design. 72mm FRONT screw-in filter; built-in telescopic hood. Effective focal length shortens toward close focus (~320mm at the 4m MFD). Single version.
Diameter mm
81
Max Aperture
f/8
Min Focus Distance
400cm
Introduced
1983
Focal Length (Max)
500mm
Focal Length (Min)
500mm