Yashinon-DX 21mm Ultra Wide Angle Lens

The Yashinon-DX Ultra Wide Angle was a 21mm f/3.3 lens manufactured by Yashica in the 1960s and 1970s. Made of 8 elements in 5 groups, the Yashinon-DX 21mm lens had an angle of view of 92º, a minimum focus of 0.8 m (2.5ft), and an m42 screw thread mount. This Japanese wide angle lens was mounted with the mirror locked in flip-up position and the subject was sighted by using the exclusive viewfinder which came with the lens. The Yashinon-DX Ultra Wide Angle lens also assured an extensive depth of field; when focused at a range of 4 m and the aperture was set a f/4, all objects within the range of 2 m and infinity would appear sharp and crisp on the film plane.