The Pentax 6x7 is a medium format SLR camera produced by Pentax beginning in 1969 and enjoying a production run until the 1990s. It operates like an over-sized 35mm SLR camera, making 10 6x7cm images per roll of 120 film. The camera has manual shutter speed and aperture controls. The body does not have an internal light meter, but the standard prism can be swapped out with a metering prism. It is also capable of using either 120 or 220 film. The camera went through three iterations during it's production run, beginning with the original Pentax 6x7. This version does not have a mirror lock-up feature. It is also known as the least internally reliable camera in the 67 line, in regard to the film advance mechanisms. Buy this version with great care and caution or at very low prices.
The Pentax 6x7 MLU is the second iteration of this camera. The MLU is very similar to the original 6x7, except that it improved upon the internal mechanics of its predecessor and also added the important mirror lock-up feature. The last version is the Pentax 67, with the infamous "x" drop in the camera name. Any external changes made with this version were merely cosmetic. Most of the updates were done internally, making this the most reliable of all three Pentax 6x7 versions.
Pentax released a fine range of lenses for these cameras, adding to the list of reasons these cameras are becoming more and more popular with age. Once a photographer gets used to the size, weight, and sound of this beast of a camera, they generally fall in love pretty quickly.
The Pentax 6x7's focal plane shutter and long flange distance make it the perfect platform for adapting unusual and unique lenses, such as this Bausch & Lomb 4.75" f1.9 projection optic. Seen here simply glued into a Pentax helical focusing adapter, the lens cannot reach infinity focus but does provide razor-thin depth of field on the large 6x7 format.