Olympus's OM extreme telephoto — the E.Zuiko Auto-T 1000mm f/11 for the longest reach.
The Olympus OM-System E.Zuiko Auto-T 1000mm f/11 is an extreme super-telephoto for the Olympus OM mount, dating from 1972 in the early OM-System range. The E.Zuiko prefix is Olympus's element-count code and the Auto-T token marks the automatic diaphragm. It was a highly specialised optic for the greatest reach in the system, used for very distant subjects and astronomical or technical work.
This is a manual-focus Olympus OM lens with a 1000mm focal length and a maximum aperture of f/11, designated E.Zuiko Auto-T. The very long focal length and slow f/11 aperture reflect the design compromise needed to reach 1000mm in a usable form. The confirmed specifications are the 1000mm focal length, the f/11 maximum aperture and the manual-focus OM mount; element count, filter arrangement and weight are omitted rather than guessed.
A 1000mm lens delivers extraordinary magnification of very distant subjects, compressing space dramatically for wildlife at long range, the moon and other far-off targets. At this focal length a solid tripod, mirror-up technique and calm air are essential, and the f/11 aperture requires bright conditions or long exposures. It is a specialist instrument for situations where nothing shorter can bridge the distance.
This extreme telephoto is rare and appears infrequently, commanding specialist prices when it does. Inspect the large glass for haze, fungus and separation, and confirm the aperture blades are dry and functional. Test the long focus mechanism for smooth travel and verify the tripod mount and any filter arrangement are complete. It can be adapted to mirrorless for extreme reach, but its focal length demands rock-steady support and patience.