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 SLR system. The E prefix in Olympus's naming convention indicates five optical elements; Auto-T denotes auto-aperture telephoto. This lens was produced throughout the OM system's lifetime for portraiture, sports, and distant-subject photography.
135mm focal length, f/3.5 maximum aperture, five-element optical formula (E.Zuiko designation), Olympus OM bayonet mount, auto-aperture operation.
The 135mm f/3.5 is a classic portrait telephoto focal length delivering a flattering perspective at comfortable working distances. Olympus OM lenses are known for their compact design and excellent Zuiko optical quality. This lens produces smooth bokeh at f/3.5 and delivers sharp results across the field from f/5.6.
Inspect for fungus, haze, and coating condition. Check OM bayonet engagement. Confirm auto-aperture mechanism operates correctly — the aperture should close down from maximum when activated and spring back on release. Aperture blades should be oil-free.