Pentax 645

Introduced in 1984, the Pentax 645 marked a significant milestone as the first medium format (6x4.5cm) single-lens reflex (SLR) camera from Pentax. It successfully bridged the gap between the convenience and affordability of 35mm systems and the superior image quality of larger roll-film formats, positioning medium format within reach of serious enthusiasts and professional photographers. This pioneering effort by Pentax demonstrated the company's technical prowess and ambition, leveraging their extensive experience in high-quality 35mm SLR design to create a versatile and relatively compact medium format camera body. The introduction of the Pentax 645 A lens mount, featuring automatic diaphragm coupling, was a crucial innovation, enabling seamless integration with a new range of modern, bright-viewfinder lenses and significantly improving the shooting workflow compared to older manual systems.

Technically, the Pentax 645 was a sophisticated machine for its era. Its vertical cloth focal plane shutter offered a respectable top sync speed and quiet operation, while the built-in TTL center-weighted metering provided reliable exposure assistance through the lens. The camera featured a large, bright pentaprism viewfinder and ergonomic controls designed for medium format handling, making it practical for handheld shooting and studio work alike. Its robust construction, featuring a die-cast aluminum alloy body and stainless-steel chassis, reflected Pentax's reputation for durability. The system gained favor among landscape, commercial, and portrait photographers seeking higher resolution than 35mm without the bulk and cost associated with larger formats like 6x7 or 4x5, though specific prominent photographers are less documented for this early model.