Released in 1964, the Yashica-Mat EM features an uncoupled light meter and a Yashinon shooting lens. The "EM" stands for Exposure Meter, referring to the uncoupled selenium cell exposure meter in front of the viewfinder. It's an all-mechanical camera with no batteries needed. It has a Copal MXV leaf shutter, capable of speeds ranging from B and 1 second to 1/500 of a second and offers flash sync at all speeds. It also has an 80 mm four-element 3.5 Yashinon lens said to be of the Tessar design and can be stopped down to F/22. The viewing lens is a 3.2 80mm Yashinon. Shutter speeds and diaphragm are set by two wheels on the front plate, the values set are shown in a window above the viewing lens. Focusing is done by a focusing wheel on the left of the camera. It has a distance scale surrounded by a depth of field scale engraved in the body. There is a small window in which you can set the ASA and DIN value of the film you use. ASA (ISO) 400 is the highest value. The body is metal, covered by black leatherette and it is quite a heavy camera, about 1.2 Kg (2.6 lb.). A film advance crank handle on the right side of the camera also loads the shutter. Other features are the ground glass waist-level finder with a Fresnel screen with red grid lines (5×5) to help composition, a viewing hood with a magnifying loupe, and the back plate of the waist finder could be flipped open to expose the sports finder for additional composition possibilities.