Duplicate listing of the Olympus 300mm f/4.5 — same lens as ID 3724 with Auto-T designation.
The Olympus Zuiko 300mm f/4.5 Auto-T is a duplicate listing of the OM-mount long telephoto described under ID 3724. The Auto-T designation indicates automatic diaphragm operation — the aperture stays open for focusing and stops down automatically when the shutter fires. At 300mm on the compact OM system, it offers serious telephoto reach.
Optical performance is good with the expected Zuiko quality. Sharpness is very good when stopped down. The multi-coating provides good contrast at this long focal length. The 300mm reach was substantial for a manual focus system. The Auto-T diaphragm operation provides a bright viewfinder for easier manual focusing at this telephoto distance.
Olympus OM mount, manual focus. Filter thread is 49mm — remarkably compact for 300mm. Weight is approximately 625 grams. Build quality is excellent precision metal. Adapts beautifully to mirrorless cameras — on Micro Four Thirds it becomes a 600mm f/4.5 equivalent with in-body stabilisation, creating an exceptionally useful wildlife setup.
Available on the used market at moderate prices. Check for smooth focus and clean optics. The tiny 49mm filter thread and lightweight design are signature OM system advantages. The MFT adaptation to 600mm equivalent is the main modern appeal. A well-regarded vintage telephoto in the OM system.