The Praktica FX is a relatively early member of the Praktica family, a 35mm SLR introduced by KW in 1952. It accepts M42 lenses but does not have a mechanism for internally stopping down later lenses such as those made for Pentax SLRs. It is named for its dual flash sync: F (for high-speed bulbs) and X (for electronic shutters,) with corresponding PC sockets on the front of the camera. It can mount and use a very large variety of lenses. It was usually sold with high-quality Zeiss or Meyer Optik lenses.
Manufacturer: Kamera Werkstätten Guthe & Thorsch (better known as “KW.”). Lens: Carl Zeiss Jena Tessar 2.8 /50mm. Lens mount: M42 screw mount, no linkage. Shutter: Focal-plane. Shutter speeds: 1/2 to 1/500 sec. + B. Film Transport: Knob, double exposure prevention. Metering: None. Exposure: Manual. Viewfinder: SLR, waist-level type, auxiliary sport finder. Flash: Dual PC sockets for F and X focal plane sync.