EF — Stands for Electro-Focus and signifies that the lens has an electronic lens mount. Since 1987 Canon SLR cameras have been designed to connect to the lens electronically. Prior to this, connection between camera body and lens was mechanical and lenses with the mechanical lens mount carried the letters FD.
EF-S — EF lenses designed to fit Canon's range of digital SLR cameras that have the smaller APS-C sensors, as in the Canon Digital Rebels (300D to 500D) and prosumer "D" models such as the 10D to 50D, plus the new 7D.
USM — Stands for ultra sonic motor. Technology pioneered by Canon that uses sound waves to position the lens elements when focusing to produce highly responsive, fast and silent focusing with excellent holding torque.
IS — Stands for Image stabilizer. Image stabilization technology allows the lens to sense movement from "shake" or vibrations and instantly apply an optical correction by moving a group of lens elements. The improvement in steadiness can be seen in the viewfinder, and IS lenses allow shooting hand-held or on a monopod at shutter speeds two to three stops slower than would normally be possible.
L — Canon's designation for their top-of-the-range, professional lenses incorporating special optical materials such as fluorite, ultra-dispersion (UD) or super UD elements. L-series lenses, which are branded with a red stripe around the barrel, are the best Canon lenses available at any given focal length or zoom range and are priced accordingly.
DO — Stands for Diffractive Optics, an optical technology developed by Canon for manufacture of telephoto lenses that are significantly shorter and lighter than previously possible, while simultaneously improving optical performance by reducing chromatic aberration. Canon produce two DO lenses, the EF 70-300mm f/4.5-5.6 DO IS USM zoom lens and the EF 400mm f/4 DO IS USM fixed focal length lens.
TS-E — specialist tilt/shift lenses that allow correction of perspective distortion and control over the focus range. These lenses are often used for architectural interiors and exteriors.
MP-E — Denotes a lens specially designed for macro photography. There is only one MP-E lens in the Canon line-up, the MP-E 65mm f/2.8 1-5x Macro Photo.
EF — Canon lens with electronic mount.
L — indicates a professional L-series lens - see above.
IS — refers to image stabilizer - see above.
USM — ultra sonic motor - see above.
Macro — Denotes a Canon macro lens, also known as a close-up lens. Macro lenses have the ability to focus an image on the film or sensor that is at least as large as the subject. This is a magnification of 1:1.
EF-S — EF lenses designed to fit Canon's range of digital SLR cameras that have the smaller APS-C sensors, as in the Canon Digital Rebels (300D to 500D) and prosumer "D" models such as the 10D to 50D, plus the new 7D.
USM — Stands for ultra sonic motor. Technology pioneered by Canon that uses sound waves to position the lens elements when focusing to produce highly responsive, fast and silent focusing with excellent holding torque.
IS — Stands for Image stabilizer. Image stabilization technology allows the lens to sense movement from "shake" or vibrations and instantly apply an optical correction by moving a group of lens elements. The improvement in steadiness can be seen in the viewfinder, and IS lenses allow shooting hand-held or on a monopod at shutter speeds two to three stops slower than would normally be possible.
L — Canon's designation for their top-of-the-range, professional lenses incorporating special optical materials such as fluorite, ultra-dispersion (UD) or super UD elements. L-series lenses, which are branded with a red stripe around the barrel, are the best Canon lenses available at any given focal length or zoom range and are priced accordingly.
DO — Stands for Diffractive Optics, an optical technology developed by Canon for manufacture of telephoto lenses that are significantly shorter and lighter than previously possible, while simultaneously improving optical performance by reducing chromatic aberration. Canon produce two DO lenses, the EF 70-300mm f/4.5-5.6 DO IS USM zoom lens and the EF 400mm f/4 DO IS USM fixed focal length lens.
TS-E — specialist tilt/shift lenses that allow correction of perspective distortion and control over the focus range. These lenses are often used for architectural interiors and exteriors.
MP-E — Denotes a lens specially designed for macro photography. There is only one MP-E lens in the Canon line-up, the MP-E 65mm f/2.8 1-5x Macro Photo.
EF — Canon lens with electronic mount.
L — indicates a professional L-series lens - see above.
IS — refers to image stabilizer - see above.
USM — ultra sonic motor - see above.
Macro — Denotes a Canon macro lens, also known as a close-up lens. Macro lenses have the ability to focus an image on the film or sensor that is at least as large as the subject. This is a magnification of 1:1.
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