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The Canon EF is a manual focus 35mm single-lens reflex camera produced by Canon between 1973 and 1978. It was compatible with Canon's FD-mount lenses. The EF was built as an electro-mechanical version of Canon's top-of-the line wholly mechanical Canon F-1. The shutter is mechanical at all speeds ½ second and faster, but at 1 second and longer ...
An example of a plastic EF-S lens mount. The Canon EF-S lens mount is a derivative of the EF lens mount created for some Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S mount are backward compatible with the EF lenses and, as such, have a flange focal distance of 44.0 mm ...
In 1987, Canon introduced the EOS Single-lens reflex camera system along with the EF lens-mount standard to replace the 16-year-old FD lens-mount standard; EOS became the sole SLR camera-system used by Canon today. Canon also used EOS for its digital SLR cameras.
Note that while an EF-S lens cannot be mounted on a camera that uses the EF mount, EF lenses can be mounted on cameras designed for the EF-S standard: for this reason, EF-S cameras carry both a red dot and a white dot on the mount. As noted above under focal length, Canon makes DSLRs with various sensor sizes, and all using the EF or EF-S lens ...
A Canon EF 100-300mm f/5.6L zoom lens. The EF 100–300mm refers to three telephoto zoom lenses produced by Canon. They are of the EF lens mount that is compatible with the EOS line of cameras. The three versions are: f / 5.6; f / 5.6L; f / 4.5–5.6 USM; The two 5.6 versions were contemporaries, launched at the beginning of the Canon EOS system.
That lens was the Canon EF 75-300mm f/4-5.6 IS USM. Canon in 2001 was the first to create a lens with DO (multi layered Diffractive Optical element) element. That lens was the Canon EF 400mm f/4 DO IS USM. Canon in 2008 created the first lens with SWC technology (Subwavelength Structure Coating). That lens was the Canon EF 24mm f/1.4L II USM.
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