yanyewkay said:then what does EOS stand for? :dunno:
Electro Optical System. The mount is fully electronic instead of the then-common mechanically-controlled link.
http://www.canon.com/camera-museum/history/canon_story/1987_1991/1987_1991.html
Apparently it's pronounced as "E-os" rather then "E-O-S". But personally prefer the latter form of pronoucation.