Tokyo Kogaku Topcon RE Super. When: 1963 Why: First TTL (through-the-lens exposure meter) SLR camera. Though TTL was already on the market with non-SLR "Mec 16 SB" camera, Topcon came in with several nice features: SLR (of course), interchangeable lens, interchangeable viewfinders, motor drive option. Currently, TTL is very important for SLR cameras mostly because of different interchangeable lens and different lens filters.
It was March 16th, 1981, one year after the introduction of the Pentax LX. The ten-millionth Pentax SLR camera, an LX, came out of AOC’s main plant in Mashiko and was given to the chief designer, then chairman of Asahi Opt. Co. Ltd. Minoru Suzuki. In order to celebrate this 10 million event, on August 25th, 1981 a limited edition "LX Gold" was introduced.