Pentax K bayonet lens mount. Introduced in 1976 with it's sister model the Pentax ME and a new line of compact lenses called the SMC Pentax M series lenses. New compact body design. - Databack, motordrive and autowinder capable. - One of the last fully mechanical cameras ever made. New type of metering cell: Gallium Photo Diode (GPD). MX specification: * Manual focus * TTL metering, manual metering only, GPD metering cells * Center weighted metering pattern * LED metering display in VF * Hot shoe and PC sync terminal (FP & X) * Shutter speed range: 1 sec - 1/1000 plus B * Horizontal moving, fabric shutter * Batteries operate meter only, all shutter speeds are mechanical * Flash sync at 1/60 * Self timer * ISO film speed range: 25-1600, set manually * Manual film advance and rewind * Interchangeable focusing screens, need special tweezers * DOF preview * Mechanical cable release socket * Shutter speed and aperture info visible in VF * The word Asahi engraved on prism housing. Turn meter on by pulling advance lever away from body or by pressing shutter release button half way. Meter auto turn-off after several seconds or by returning advance lever to flush position. Optional accessories include: - Dial Data MX - Bulk Film Magazine MX - Winder MX (2 fps) - Motor Drive MX (5 fps). Uses: 2-MS76 batteries.