The Pentax KX was one of the three original K-mount 35mm SLR cameras introduced by Pentax as a replacement for the Spotmatic family of screw mount cameras. The K mount offered greater convenience and enabled the production of faster lenses such as the 50 mm f/1.2.
The KX model was one step up from the KM with a more sensitive light meter, a wider ISO range, and mirror lock-up. It had a match-needle exposure readout so that the shutter speed set was indicated in the viewfinder. The aperture set on the lens was visible in the viewfinder through a small window. The KX is the only Pentax where the wind lever must be pulled slightly out for the meter to work. This makes the camera unsuitable for left-eyed users.
Lens: SMC PENTAX 1:1.4/50. ISO range: 8 – 6400. Shutter speeds: 1 – 1/1000s, B. Viewfinder type: Pentaprism