OLYMPUS OM-1/1N

Type: 35mm single lens reflex camera with interchangeable lenses using Olympus OM bayonet lens mount. Focusing: Manual via split-image rangefinder and microprism collar (Focusing Screen 1-13).

Metering: TTL fully-averaging measurement using two CdS cells. Open aperture metering with centre-weighted average measurements. Metering range = EV 2.017.0 (ISO 100 and f/1.4).

ISO Range: 25-1600.

Exposure Modes: Manual.

Shutter Type/Speeds: Mechanicallycontrolled focal plane, horizontal travel, cloth curtains. 1-1/1000 second plus ‘B’. Flash sync up to 1/60 second.

Exposure Compensation: Not applicable. Viewfinder: Optical pentaprism type with interchangeable focusing screens (choice of 13). Magnification = 0.92x. Coverage = 97 percent. Scene coverage = 97 percent. Needle-type plus/minus exposure indicator. OM-1N has flash ready/OK LED indicator.

Film Transport: Manual frame advance via single/multiple-stroke lever with 150-degree throw and 30-degree standoff. Manual rewind via fold-out crank. Double exposure override. OM-1MD and OM-1N accept Motor Drive 1 and Winder 2 for automatic film advance at up to 5.0fps. Winder 1 has single frame auto advance.

Flash: External flash units sync via accessory hotshoe (Accessory Shoe 1, or 4 for the OM-1N) or PC terminal.

General Features: Mirror lock-up, cable release terminal, depth-of-field preview lever, self-timer (4 to 12 seconds delay, cancellable), detachable camera back. Power Source: One 1.35V button-type battery (625 type). Wein MRB625 zinc-air battery is a direct replacement. Can be used with a 675-type hearing aid battery (which may require a small modification to the battery compartment).

Dimensions (WxHxD): 136 x 83 x 50mm (body only).

Weight: 510g (body only, w/o battery). Launch Date: September 1972 as the M-1. February 1973 as the OM-1. OM-1MD introduced in 1974 and OM-1N in 1979. Made in Japan.