 Michelle B. Prince |
Digital terms What does the EF stand for in the EF lenses?
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Mellanie |
This is what I have found: EF — This refers to Canon's electronic lens mount, used in all Canon camera since 1987. The previous mechanical lens mount carried the letters FD. Located at this website: hope this helps,
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Jon Close |
Canon's first SLR, the Canoflex, used a bayonet mount that Canon dubbed "R" for Reflex. With the introduction of the F-series SLRs, the lens/camera mount was improved to provide better coupling and TTL metering. The improved lens series was named "FL", probably for reFLex and to distinguish the line from Nikon's F-mount. The mounting lugs were the same as the R, but aperture actuation was changed. The lens line was further refined for autoexposure, with the "FD" (reFlex auto-Diaphram?) lenses. "New FD" lenses did away with the breech-locking ring of the R/FL/FD lenses and instead used the familiar mounting method of twisting the entire lens and securing with a lock pin. The mount for the EOS [EOS = Electro-Optical System, and/or Eos - Greek goddess of the dawn (of a new era of SLRs)] cameras was done as a clean-sheet approach, with a larger diameter mount, and all-electronic control of aperture/focus. The "EF" designation is probably "Electronic F-mount" or "Electronic reFlex".
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