The Pentax K1000 (originally marked the Asahi Pentax K1000) is an interchangeable lens, 35 mm film, single-lens reflex (SLR) camera, manufactured by Asahi Optical Co., Ltd. from 1976 to 1997, originally in Japan. The K1000's extraordinary longevity makes it a historically significant camera. The K1000's inexpensive simplicity was a great virtue and earned it an unrivaled popularity as a basic but sturdy workhorse. The Pentax K1000 eventually sold over three million units. Description The K1000, introduced in 1976, is the simplest member of Asahi Optical's Pentax K-series 35mm SLRs. The other members are the Pentax K2, KM, and KX, introduced in 1975, and the K2 DMD of 1976. All have the same basic body design, but with differing feature levels, electronics, and controls. The K1000 was the KM with the self-timer, depth of field pre-view and some other features removed to save cost. It uses a horizontal travel, rubberized silk cloth focal plane shutter with a speed range of 1/1000 second to 1 second, along with Bulb and a flash X-sync of 1/60 second. It is 91.4 millimetres (3.6 inches) tall, 143 mm (5.6 in) wide, and 48 mm (1.9 in) deep, and weighs 620 grams (21.9 ounces). The body was finished in black leather with chrome trim only, although early production Pentax K1000 SE bodies had brown leather with chrome trim. The introductory US list price for the K1000 body with SMC Pentax 55 mm f/2 lens was $299.50. In 1983, a K1000 with SMC Pentax-M 50 mm f/2 lens listed for $220; in 1988, the body was $210, but $290 with SMC Pentax-A 50 mm f/2; in 1993, the body was $263. The body was priced at $315 in 1994 and remained there until discontinued. Note that SLRs usually sold for 30 to 40 percent below list price. Features The K1000 is an almost-all metal, mechanically (springs, gears, levers) controlled, manual-focus SLR with manual-exposure control. It is completely operable without batteries. Batteries are only required (one A76 or S76, or LR44 or SR44, silver oxide 357 or 303) for the light metering information in the viewfinder. This consists of a centre-the-needle exposure control system using a galvanometer needle pointer moving between vertically arranged +/– over/underexposure markers to indicate the readings of the built-in full-scene averaging, cadmium sulfide (CdS)battery light meter versus the actual camera settings. The meter does not have an on/off switch and the lens cap must