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The EF-S lens mount is a derivative of the EF lens mount created for a subset of Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras supporting the EF-S mount are backward-compatible with the EF lens mount. Only Canon cameras with the APS-C sized sensor released after 2003 support the mount. All other cameras do not support it.

The "S" in EF-S stands for "short back focus", which means that the rear element of the lens is closer to the image sensor than on regular 35 mm SLR cameras. The proximity of the rear element to the image sensor greatly enhances the possibilities for wide angle and very wide angle lens, enabling them to be made smaller, lighter (containing less glass), faster (larger aperture) and less expensive. Most current Canon EF-S lenses are wide angle.

Lenses designed specifically for APS-C sized sensors are often optically designed to provide a narrower light cone to match the sensor. However, not all such lenses require the shorter back focus, and may feature the standard EF mount. Such lenses will give noticeable vignetting if used on a 35mm film or sensor camera.

[edit] Compatibility

The cameras that can use the EF-S mount are:

• 300D/Digital Rebel
• 350D/Digital Rebel XT
• 400D/Digital Rebel XTi
• 450D/Digital Rebel XSi
• 500D/Digital Rebel T1i
• 1000D/Rebel XS
• 20D
• 20Da
• 30D
• 40D
• 50D

Canon designers have taken steps to ensure it is physically impossible to mount EF-S lenses on EF-only cameras. This is because the increased proximity of the lens to the sensor means that on full-frame sensor or 35mm film EF cameras the lens itself would obstruct the mirror's movement and cause damage to the lens and/or camera. While it is possible to modify the lens such that the physical obstruction is removed, allowing for mounting to EF mount cameras, the rear of the lens would still obstruct the mirror. An additional reason is that the lenses produce a smaller image circle of even illumination (circle of no vignetting). To assist the photographer, an EF-S lens alignment mark is indicated by a small white rectangle, whereas the EF lenses and mounts use a small red dot. EF-S camera bodies have both EF-S and EF alignment marks, while EF bodies have only EF marks. Some have reported success attaching EF-S lenses to full-frame bodies with the use of an extension tube; however, this does not eliminate the vignetting problem, and also removes the lens's ability to achieve infinite focus. [1]

The 10D, D60, and earlier cameras share the EF-only mount with the full frame EOS camera bodies, and also with the APS-H size EOS camera bodies (1D series), despite having a smaller sensor and therefore a smaller mirror. However, attempting this on full frame Canon EF mount cameras would cause the mirror to collide with the rear lens element, potentially damaging the lens and/or camera.

[edit] List of EF-S lenses

The EF-S lens mount is a relatively new offering from Canon, so the selection of available lenses is limited compared to the full EF range, but it is backwards compatible with the EF mount, and can therefore still accept all EF lenses. As of 2008, no EF-S lens has been produced with the "L" designation or with Diffractive optics.

Focal length	Effective focal length (×1.6 crop factor)	Aperture range	Mark	Macro	USM	IS	L-series	DO
Canon EF-S 10–22mm	16–35.2 mm	f/3.5–4.5		No	Yes	No	No	No
Canon EF-S 17–55mm	27.2–88 mm	f/2.8		No	Yes	Yes	No	No
Canon EF-S 17–85mm	27.2–136 mm	f/4–5.6		No	Yes	Yes	No	No
Canon EF-S 18–55mm	28.8–88 mm	f/3.5–5.6	I	No	No	No	No	No
			I	No	Yes	No	No	No
			II	No	No	No	No	No
			II	No	Yes	No	No	No
				No	No	Yes	No	No
Canon EF-S 18–200mm	28.8–320 mm	f/3.5–5.6		No	No	Yes	No	No
Canon EF-S 55–250mm	88–400 mm	f/4–5.6		No	No	Yes	No	No
Canon EF-S 60mm	96 mm	f/2.8		Yes	Yes	No	No	No

[edit] References

• EF/EF-S lens chart
• Canon Camera Museum
• Making EF-S compatible to a 10D [2]

v • d • e Canon EF/EF-S lenses EF-S Zoom EF-S 10-22mm EF-S 17-55mm | EF-S 17-85mm | EF-S 18-55mm | EF-S 18-200mm EF-S 55-250mm Ultra-Wide Zoom EF 16-35mm | EF 17-40mm | EF 20-35mm Standard Zoom EF 24-70mm | EF 24-85mm | EF 24-105mm | EF 28-80mm | EF 28-90mm | EF 28-105mm | EF 28-135mm | EF 28-200mm | EF 28-300mm Telephoto Zoom EF 55-200mm | EF 70-200mm | EF 70-300mm | EF 75-300mm | EF 80-200mm | EF 90-300mm | EF 100-300mm | EF 100-400mm Wide-Angle Prime EF 14mm | EF 20mm | EF 24mm | EF 28mm | EF 35mm Standard Prime EF 50mm Telephoto Prime EF 85mm | EF 100mm | EF 135mm | EF 200mm Super Telephoto Prime EF 300mm | EF 400mm | EF 500mm | EF 600mm | EF 800mm | EF 1200mm Distorting lenses EF 15mm Fisheye | EF 135mm with Softfocus Tilt-shift TS-E 17mm | TS-E 24mm | TS-E 45mm | TS-E 90mm Macro EF 50mm Compact Macro | EF-S 60mm Macro | MP-E 65mm 1-5x Macro | EF 100mm Macro | EF 180mm Macro Lens accessories Extender EF | Extension Tube Discontinued Zoom EF 17-35mm | EF 22-55mm | EF 28-70mm | EF 70-210mm

Canon SLR cameras and lens mounts (film)
Lens Mount	Series	Model
R		Flex (1959), R2000 (1960), RP (1961), RM (1962)
FL		FX (1964), FP (1964), Pellix (1965), FT QL (1966), Pellix QL (1966), TL (1968)
FD	F	Amateur: FTb (1971), FTbn (1973), EF (1973), TLb (1974), TX (1975)
		Professional: F-1(1971), F-1n (1976), New F-1 (1981)
	A	AE-1 (1976), AT-1 (1976), A-1 (1978), AV-1 (1979), AE-1 Program (1981), AL-1 (1982)
	T	T50 (1983), T70 (1984), T80 (1985), T90 (1986), T60 (1990)
EF
	1	EOS-1 (1989), EOS-1N (1994), EOS-1N RS (1995), EOS-1v (2001)
		EOS 650 (1987), EOS 620 (1987), EOS 750QD (1988), EOS 850QD (1988), EOS 630QD (1989), EOS RT (1989), EOS 700QD (1989), EOS 10sQD (1990), EOS 1000F (1990), EOS 100 (1991), EOS EF-M (1991), EOS 5/5QD/A2/A2e (1992), EOS 1000FN (1992), EOS 500 (1993), EOS 888 (1993), EOS 50 (1995), EOS 500N (1996), EOS-3 (1998), EOS 88 (1999), EOS 300 (1999), EOS 30 (2000), EOS 3000N (2002), EOS 300V (2002), EOS 3000V (2003), EOS 30V (2004), EOS 300X (2004)
	IX	EOS IX, EOS IX Lite
		Canon DSLR cameras
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