Canon EOS is an autofocus single-lens reflex camera (SLR) and mirrorless camera series produced by Canon Inc. Introduced in 1987 with the Canon EOS 650, all EOS cameras used 35 mm film until October 1996 when the EOS IX was released using the new and short-lived APS film. In 2000, the D30 was announced, as the first digital SLR designed and produced entirely by Canon. Since 2005, all newly announced EOS cameras have used digital image sensors rather than film. The EOS line is still in production as Canon's current digital SLR (DSLR) range, and, with the 2012 introduction of the Canon EOS M, Canon's mirrorless interchangeable-lens camera (MILC) system. In 2018 the system was further extended with the introduction of the EOS R camera, Canon's first full frame mirrorless interchangeable lens system.
Features of EF-lens
A Speedlite 550EX, an early E-TTL flash from 1998
Canon EOS 650D, a Canon entry-level DSLR
Canon EOS M, Canon's first mirrorless system camera
An autofocus optical system uses a sensor, a control system and a motor to focus on an automatically- or manually-selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication. Autofocus methods are distinguished as active, passive or hybrid types.
Several green focus points/areas indicating where the autofocus has locked
One selected green focus point using pinpoint autofocus
Active autofocus system via infrared - Canon AF35M (1979)
Early passive autofocus system integrated in the lens with Pentax ME-F (1981)