Pentax 645

The Pentax 645 is a medium format SLR camera, introduced at the 1984 PMA. It takes 15 pictures nominally 6x4.5 cm, on 120 roll film, or 30 on 220 film, and it can also use 70 mm film, which gives approximately 90 frames per roll. It has a built-in motor drive and a low-profile prism viewfinder with built-in dioptric correction. The camera looks somewhat like the Mamiya M645 E (but predates it by several years, and also offers more exposure options than any of the manual-focus M645 cameras).