EF lens mount Canon EOS

features of ef-lens

the bayonet-style ef lens mount @ centre of eos camera system. breaking compatibility earlier fd mount, designed no mechanical linkages between moving parts in lens , in camera. aperture , focus controlled via electrical contacts, motors in lens itself. similar in ways canon s earlier attempt @ af t80. other manufacturers including contax (with g series of interchangeable-lens 35 mm rangefinder cameras), nikon s 1983 f3af , olympus (with 4 thirds system) have since embraced type of direct drive system. large lens mount compared of competition, enabling use of larger aperture lenses.