The Werra is a series of 35mm viewfinder or rangefinder cameras manufactured by the Carl Zeiss Jena factory which was primarily a lens-making plant. The Werra is named after a small German river.
The cameras offer a high degree of control with a minimum number of levers, knobs or rings. In their simplest incarnations, the Werras featured only a shutter release button on the top plate. With its streamlined styling, one could call the Werras a design camera. Nearly all other controls were incorporated into the lens barrel.
The most unique feature of the Werra is the covered ring around the lens barrel. Twisting the ring cocks the shutter and advanced the film in one motion. In addition, the lens cap doubles as a shade.