The Canon EOS (Electro-Optical System) autofocus 35 mm film and digital SLR camera system was introduced in 1987 with the Canon EOS 650 and is still in production as Canon's current DSLR and recently released Canon EOS M mirrorless interchangeable-lens camera (MILC) systems. The acronym EOS was chosen for Eos, the Titan Goddess of dawn in Greek mythology, and is often pronounced as a word ( /ˈiː.ɒs/ or /ˈiː.ɑːs/), although some spell out the letters, reading it as an initialism.
It competes primarily with the Nikon F series and its successors, as well as autofocus SLR systems from Olympus Corporation, Pentax, Sony/Minolta, and Panasonic/Leica. In 2010, Canon held 44.5% market share in DSLRs.
At the heart of the system is the EF lens mount, which replaced the previous FD lens mount.
Read more about Canon EOS: EF Lens Mount, EOS Flash System, EOS Cameras
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