EOS.

System name for Canon’s autofocus SLR cameras and accessories, introduced in 1987. Acronym for “electro-optical system,” though it’s also a reference to Eos, the Greek goddess of the dawn.

EOS cameras are of particular note because the lenses are entirely electronically controlled - there are no mechanical levers for focus or aperture control. This means that focus and aperture control motors are both built into the lens and not the camera body. While this adds a small additional overhead to the cost of each lens it also means that lens motors can be optimized for each lens type and size rather than relying on a camera with a motor that must work with whatever type of lens is attached.

Lenses which work with EOS cameras are known as EF type lenses, with EF-S a variant introduced in 2003.

cf. Canon, FD, EF, EF-S, single lens reflex (SLR).

Entry last updated 2004-02-11. Term 423 of 1487.

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