Olympus's OM telephoto — 100mm f/2.8 E.Zuiko for portraits and moderate telephoto work.
The Olympus E.Zuiko 100mm f/2.8 is a compact telephoto prime for the OM system — 100mm providing useful portrait compression at f/2.8. The E.Zuiko designation indicates the specific optical formula generation.
Optically good — sharp from f/4 with the 100mm providing classic portrait telephoto compression. The OM system's compact design keeps even the 100mm relatively small. E.Zuiko quality optics.
Olympus OM mount with 49mm filter thread. Compact for 100mm — OM miniaturisation. Manual focus. The 100mm provides useful portrait reach in the OM system.
Available used very cheaply. The OM 100mm f/2.8 provides budget portrait telephoto for the OM system or adapted mirrorless. The OM system's 49mm filter thread is consistently compact.