Come the 1980s, competition in the SLR camera market grew increasingly fierce amongst manufacturers. New products that featured exposure control, film feeding and other automation technologies were released one after another, and market shares changed dynamically with every hit product. With functional improvements and product development characterizing the SLR camera market at the time, Cosina released a compact and simple SLR camera. Dubbed the CT-1, this camera incorporated a mechanical shutter when it debuted in 1979. It could take pictures even without a battery and eventually was delivered all around the world. The CT-1 would eventually become the base model of the BESSA Family of cameras. The CX Series of compact cameras debuted in 1980. They were copied by LOMO (Leningrad Optical Mechanical amalgamation) of the former Soviet Union and became popular in the West after being rediscovered by dilettantes in Austria. In 1982, Cosina began producing interchangeable lenses for SLR bodies made by big name manufacturers. There would eventually be as many as 7 kinds of mounts. Production later expanded to interchangeable lenses for AF SLR cameras in the 1990s. When buying an SLR camera, the trend was to get a double zoom lens kit. Strongly demanded at the time were highly functional, cost-competitive products. Cosina developed its manufacturing efforts to meet those demands.