Canon EF-S lens mount

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 a subset of 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. Such cameras, however, have more clearance, allowing lens elements to be closer to the sensor than in the EF mount. Only Canon cameras released after 2003 with APS-C sized sensors support the EF-S mount.

The "S" in EF-S comes from "Small image circle", meaning the lens is designed to provide a small (relative to a normal EF lens) image circle to match the sensor.^[1] The smaller mirror used in APS-C cameras also allows optical elements to protrude further into the camera body, which enhances the possibilities for wide angle and very wide angle lenses, enabling them to be made smaller, lighter (containing less glass), faster (larger aperture) and less expensive.

Although not all Canon EF-S lenses use this short back focus, they cannot be mounted on DSLRs with sensors larger than APS-C. However, some lenses produced by third-party manufacturers may feature the standard EF mount if they do not require the shorter back focus but only have a small image circle. Such lenses will give noticeable vignetting if used on a 35mm film or full frame sensor cameras. To a lesser degree, vignetting also occurs with APS-H sensor sizes, such as several (now discontinued) cameras of the 1D series.

Compatibility

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

An EF-S compatible body, the Canon EOS 400D, with open lens mount

An EF-S compatible mount close-up, from the Canon 30D. Note the circular indent inside the mount, which corresponds to the raised ring on the lens.

By design, 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). An EF-S lens alignment mark is indicated by a small white rectangle, whereas the EF employs a small red dot. The lens will insert into the body when the alignment marks on each are matched, and the lens can then be rotated and locked into the operating position. 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 infinity focus.^[2] Also, attachment of EF-S lenses on EF bodies can often be accomplished by removing the small plastic ring seen in the photo above. Although vignetting is still an issue, photos can be taken, and infinity focus achieved. This modification comes with caveats, one being that on some lenses, like the EF-S 10-22mm, at the 10mm setting, the element protrudes too far back toward EF mount camera bodies.

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 prior to the 1D X), despite having a smaller sensor and therefore a smaller mirror.

List of EF-S lenses

Focal length	Equivalent focal length (×1.6 crop factor)	Minimum Aperture range	Mark	Introduced	Macro	USM	STM	IS	L-series	DO
10–18mm	16–28.8 mm	f/4.5–5.6		2014	No	No	Yes	Yes	No	No
10–22mm	16–35.2 mm	f/3.5–4.5		2004	No	Yes	No	No	No	No
15–85mm	24–136 mm	f/3.5–5.6		2009	No	Yes	No	Yes	No	No
17–55mm	27.2–88 mm	f/2.8		2006	No	Yes	No	Yes	No	No
17–85mm	27.2–136 mm	f/4–5.6		2004	No	Yes	No	Yes	No	No
18–55mm	28.8–88 mm	f/3.5–5.6	I	2003	No	No	No	No	No	No
I (Jpn.)	2003	No	Yes	No	No	No	No
II	2005	No	No	No	No	No	No
II (Jpn.)	2005	No	Yes	No	No	No	No
III	2011	No	No	No	No	No	No
IS	2007	No	No	No	Yes	No	No
IS II	2011	No	No	No	Yes	No	No
IS STM	2013	No	No	Yes	Yes	No	No
18–135mm	28.8–216 mm	f/3.5–5.6	IS	2009	No	No	No	Yes	No	No
IS STM	2012	No	No	Yes	Yes	No	No
IS USM	2016	No	Yes	No	Yes	No	No
18–200mm	28.8–320 mm	f/3.5–5.6		2008	No	No	No	Yes	No	No
55–250mm	88–400 mm	f/4–5.6	I	2007	No	No	No	Yes	No	No
II	2011	No	No	No	Yes	No	No
IS STM	2013	No	No	Yes	Yes	No	No
24mm	38.4 mm	f/2.8	STM	2014	No	No	Yes	No	No	No
60mm	96 mm	f/2.8		2005	Yes	Yes	No	No	No	No

References

↑ "Technical Hall - Technical report 2004.1". Canon.com. Retrieved 2013-06-10.
↑ "Canon EF-S 17-55mm f/2.8 IS USM Lens Review". The-digital-picture.com. Retrieved 2013-06-10.

External links

Canon EF/EF-S/EF-M lenses

EF-S zoom	EF-S 10–18mm EF-S 10–22mm EF-S 15–85mm EF-S 17–55mm EF-S 17–85mm EF-S 18–55mm EF-S 18–135mm EF-S 18–200mm EF-S 55–250mm

Ultra-wide zoom	EF 11–24mm EF 16–35mm EF 17–40mm

Standard zoom	EF 24–70mm EF 24–105mm EF 28–135mm EF 28–300mm

Telephoto zoom	EF 70–200mm EF 70–300mm EF 75–300mm EF 100–400mm EF 200–400mm

Wide-angle prime	EF 14mm EF 20mm EF 24mm EF-S 24mm EF 28mm EF 35mm

Standard prime	EF 40mm 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

Distorting lens	EF 8–15mm Fisheye

Tilt-shift	TS-E 17mm TS-E 24mm TS-E 45mm TS-E 90mm

Macro	EF-M 28mm Macro EF 50mm Compact Macro EF-S 60mm Macro MP-E 65mm 1–5x Macro EF 100mm Macro EF 180mm Macro

EF-M zoom	EF-M 11–22mm EF-M 15–45mm EF-M 18–55mm EF-M 18–150mm EF-M 55–200mm

EF-M prime	EF-M 22mm EF-M 28mm Macro

Lens accessories	Extender EF

Discontinued zoom	EF 17–35mm EF 20–35mm EF 22–55mm EF 24–85mm EF 28–70mm EF 28–80mm EF 28–90mm EF 28–105mm EF 28–200mm EF 35–70mm EF 35–80mm EF 35–105mm EF 35-135mm EF 35–350mm EF 38–76mm EF 50–200mm EF 55–200mm EF 70–210mm EF 80–200mm EF 90–300mm EF 100–200mm EF 100–300mm

Discontinued prime	EF 15mm Fisheye EF 135mm with Softfocus EF 1200mm

Canon SLR cameras and lens mounts (film)

Lens Mount R

Canonflex (1959)
Canonflex R2000 (1960)
Canonflex RP (1961)
Canonflex RM (1962)

EX EE (1969)
EX AUTO (1972)

FX (1964)
FP (1964)
Pellix (1965)
FT QL (1966)
Pellix QL (1966)
TL (1968)

Amateur	FTb (1971) FTbn (1973) EF (1973) TLb (1974) TX (1975)

Professional	F-1(1971) F-1n (1976) New F-1 (1981)

AE-1 (1976)
AT-1 (1977)
A-1 (1978)
AV-1 (1979)
AE-1 Program (1981)
AL-1 (1982)

T50 (1983)
T70 (1984)
T80 (1985)
T90 (1986)
T60 (1990)

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) 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

See also: Canon EOS digital cameras

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