Olympus's OM telephoto — the E.Zuiko Auto-T 135mm f/3.5 for the OM system.
The Olympus E.Zuiko Auto-T 135mm f/3.5 is a telephoto prime for the Olympus OM mount. The E.Zuiko designation indicates an earlier optical version. Auto-T indicates automatic diaphragm. At 135mm f/3.5, it provides classic telephoto reach. Zuiko quality ensures good optics. The OM mount adapts to mirrorless cameras. A solid vintage OM telephoto.
Good Zuiko optical quality. Sharpness respectable from f/3.5 and good stopped down. The E.Zuiko version predates the later MC (multi-coated) versions — the MC version provides better contrast. The 135mm provides classic telephoto for portraits. Auto-T diaphragm provides bright viewfinder. OM mount adapts well to mirrorless.
Olympus OM mount. Filter thread 49mm — compact for 135mm. Weight compact — the OM system's portable philosophy. Build quality excellent Zuiko metal. Manual focus with auto diaphragm. The OM mount adapts to mirrorless. The MC version is preferred for multi-coating — the E.Zuiko is the earlier single-coated variant.
Very affordable. Good Zuiko quality. The MC version is preferred for coating. OM mount adapts to mirrorless — becomes 270mm on MFT. 49mm filter — compact. A solid vintage telephoto. The MC version commands a small premium but the E.Zuiko is optically adequate.