Olympus's compact mechanical SLR — the OM-1 MD, TTL match-needle metering, OM mount, motor-drive ready.
The Olympus OM-1 MD is a 35mm film SLR that Olympus introduced as part of the compact OM system designed by Yoshihisa Maitani. First launched in 1972 as the M-1 and renamed OM-1 after objection from Leica, the OM-1 established a smaller and quieter SLR body than the larger cameras common at the time. The MD designation indicates a body prepared to accept the OM motor drive on its baseplate. It sits as the mechanical flagship of the early OM line and was sold widely across the UK and Europe.
As a specification summary, the OM-1 MD is a single-lens reflex camera for 35mm film using the Olympus OM bayonet mount. It has a horizontal-travel cloth focal-plane shutter with speeds from 1 second to 1/1000 plus Bulb, and unusually the shutter speed dial is positioned concentrically around the lens mount rather than on the top plate. Metering is through-the-lens centre-weighted using a CdS cell, shown by a match-needle in the viewfinder, and it works in manual mode only. The shutter is fully mechanical and fires at all speeds without a battery; the battery powers only the meter.
The OM-1 MD suits photographers who want a small, light mechanical SLR for travel, street and general use, and its size and low mirror-and-shutter noise made it a common choice for handheld work. Because the shutter is mechanical it remains usable when the meter battery is dead, which appeals to users who prefer a camera independent of electronics. The large, bright viewfinder and interchangeable focusing screens add to its handling for careful composition.
On the used market, check the foam light seals and the mirror-damper foam, which perish with age on OM bodies and can leave crumbs on the mirror. The original meter was calibrated for a 1.35V mercury PX625 cell, now banned, so meter readings can be off unless a modern replacement or adjustment is used; confirm the meter needle responds and tracks light. Test the shutter across speeds for capping or sticking, inspect the prism for foam-related haze or desilvering, and check the film advance and rewind feel along with the focusing screen for fungus or marks.