Olympus's pro OM super-fast telephoto — the Zuiko Auto-T 250mm f/2 ED for low-light sport.
The Olympus OM-System Zuiko Auto-T 250mm f/2 ED is an ultra-fast professional telephoto for the Olympus OM mount, introduced in 1983. It was one of Olympus's specialist high-speed ED lenses built for sports and demanding professional work. The Auto-T token marks the automatic diaphragm and the ED designation indicates extra-low-dispersion glass; it sat among the most extreme optics in the OM range.
This is a manual-focus Olympus OM lens with a 250mm focal length and a maximum aperture of f/2, designated Auto-T with ED glass. An f/2 aperture at 250mm made this a very large, heavy and specialised lens, with the ED element used to suppress chromatic aberration at long focal length. The confirmed specifications are the 250mm focal length, the f/2 maximum aperture, the ED glass and the manual-focus OM mount; element count, filter arrangement and weight are omitted rather than guessed.
A 250mm f/2 combines long reach with extreme speed, isolating distant subjects sharply against smoothly blurred backgrounds and gathering light for fast shutter speeds. It was made for indoor and floodlit sport, wildlife and situations where both reach and low-light capability are essential. The ED glass keeps fringing controlled wide open, where such a lens spends most of its working life.
This is a rare, high-end OM lens that surfaces only occasionally and carries a very high price among collectors and specialists. Inspect the large glass thoroughly for haze, fungus and separation, confirm the ED element and coatings are clean, and check the aperture blades are dry and responsive. Verify the heavy focusing action is smooth and the tripod collar and mount are sound. It is a prized adaptation on mirrorless, so expect scarcity and strong demand.