Canon EF-S lens mount - AbsoluteAstronomy.com

The EF-S lens mount is a derivative of the EF lens mount

Canon EF lens mount

Introduced in 1987, the EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens...

created for a subset of Canon digital single-lens reflex camera

Digital single-lens reflex camera

Most digital single-lens reflex cameras are digital cameras that use a mechanical mirror system and pentaprism to direct light from the lens to an optical viewfinder on the back of the camera....

s with APS-C

APS-C

Advanced Photo System type-C is an image sensor format approximately equivalent in size to the Advanced Photo System "classic" size negatives...

sized image sensors. It was released in 2003. Cameras supporting the EF-S mount are backward-compatible with the EF lens mount and, as such, have a flange focal distance

Flange focal distance

For an interchangeable lens camera, the flange focal distance of a lens mount system is the distance from the mounting flange to the...

of 44.0 mm. Cameras supporting EF-S, however, have more clearance, allowing lens elements to be closer to the sensor than in the EF mount. Only Canon cameras with the APS-C sized sensor released after 2003 support the EF-S mount.

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

35 mm film

35 mm film is the film gauge most commonly used for chemical still photography and motion pictures. The name of the gauge refers to the width of the photographic film, which consists of strips 35 millimeters in width...

SLR camera

Single-lens reflex camera

A single-lens reflex camera is a camera that typically uses a semi-automatic moving mirror system that permits the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to pre-SLR cameras where the view through the viewfinder could be significantly...

s. The proximity of the rear element to the image sensor greatly enhances the possibilities for wide angle and very wide angle lenses, enabling them to be made smaller, lighter (containing less glass), faster (larger aperture

Aperture

In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are,...

) 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

Vignetting

In photography and optics, vignetting is a reduction of an image's brightness or saturation at the periphery compared to the image center. The word vignette, from the same root as vine, originally referred to a decorative border in a book. Later, the word came to be used for a photographic...

if used on a 35mm film or sensor camera.

Compatibility

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

EOS 7D
Canon EOS 7D
The Canon EOS 7D is an 18.0 effective megapixel APS-C crop CMOS digital single-lens reflex camera made by Canon. It was announced on September 1, 2009...
EOS 20D
Canon EOS 20D
The Canon EOS 20D is an 8.2-megapixel semi-professional digital single-lens reflex camera, initially announced on August 19, 2004 at a recommended retail price of US$1,499. It is the successor of the EOS 10D, and was succeeded by the EOS 30D in August 2006...
EOS 20Da
EOS 30D
Canon EOS 30D
The Canon EOS 30D is an 8.2-megapixel semi-professional digital single-lens reflex camera, initially announced on February 21, 2006. It is the successor of the Canon EOS 20D, and is succeeded by the EOS 40D...
EOS 40D
Canon EOS 40D
The Canon EOS 40D is a 10.1-megapixel semi-professional digital single-lens reflex camera. It was initially announced on August 20, 2007 and was released at the end of that month. It is the successor of the Canon EOS 30D, and is succeeded by the EOS 50D. It can accept EF and EF-S lenses...
EOS 50D
Canon EOS 50D
The Canon EOS 50D is a 15.1-megapixel digital single-lens reflex camera. It is part of the Canon EOS line of cameras and succeeds the EOS 40D. In turn, it has been succeeded by the EOS 60D....
EOS 60D
Canon EOS 60D
The Canon EOS 60D is a digital single-lens reflex camera from Canon. It is part of the Canon EOS line of cameras and succeeds the EOS 50D. It was publicly announced on August 26, 2010....

EOS 300D/Digital Rebel
Canon EOS 300D
The Canon EOS 300D, manufactured by Canon, marketed in North America as the EOS Digital Rebel, and in Japan as the EOS Kiss Digital, is a 6.3-megapixel entry-level digital single-lens reflex camera. It was initially announced on 20 August, 2003 at a price point of $899 without lens, $999 with the...
EOS 350D/Digital Rebel XT
Canon EOS 350D
The Canon EOS 350D is an 8.0-megapixel entry-level digital single-lens reflex camera manufactured by Canon. The model was initially announced in February 2005. It uses Compact Flash storage and a Lithium ion battery...
EOS 400D/Digital Rebel XTi
Canon EOS 400D
The EOS 400D, called Digital Rebel XTi in North America and EOS Kiss Digital X in Japan, is a mid-range digital single-lens reflex camera introduced by Canon August 24, 2006....
EOS 450D/Rebel XSi
Canon EOS 450D
The EOS 450D is a 12.2-megapixel digital single-lens reflex camera that is part of the Canon EOS line of cameras. It is the successor to the EOS 400D/Digital Rebel XTi. It was announced on the 23 January 2008 and released in March 2008 and April 2008 in North America...
EOS 500D/Rebel T1i
Canon EOS 500D
The Canon EOS 500D is a 15.1 megapixel digital single-lens reflex camera, announced by Canon on 25 March, 2009. It was released in May 2009. It is known as the EOS Kiss X3 in Japan, and as the EOS Rebel T1i in North America...
EOS 550D/Rebel T2i
Canon EOS 550D
The Canon EOS 550D is an 18.0 megapixel digital single-lens reflex camera, announced by Canon on February 8, 2010. It was made available starting February 24, 2010 and to US dealers starting early March. It is known as the EOS Kiss X4 in Japan, and as the EOS Rebel T2i in North America...
EOS 600D/Rebel T3i
Canon EOS 600D
The Canon EOS 600D is an 18.0 megapixel digital single-lens reflex camera, released by Canon on February 7, 2011. It is known as the EOS Kiss X5 in Japan and the EOS Rebel T3i in the United States and Canada...

EOS 1000D/Rebel XS
Canon EOS 1000D
Canon EOS 1000D is a 10.1-megapixel digital single-lens reflex camera announced by Canon on June 10, 2008 and started shipping in mid August of 2008. It is known as the EOS Kiss F in Japan and the EOS Rebel XS in the United States and Canada...
EOS 1100D/Rebel T3
Canon EOS 1100D
Canon EOS 1100D is a 12.2-megapixel digital single-lens reflex camera announced by Canon on February 7, 2011. It is known as the EOS Kiss X50 in Japan and the EOS Rebel T3 in the United States and Canada. The 1100D is an entry-level DSLR that introduces movie mode to Canon's entry level DSLRs and...

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

Image circle

The image circle, or circle of illumination, of a lens is the circular area in the image plane formed by the cone of light transmitted by the lens . Within this circle is the smaller circle for which image definition is acceptable, the circle of good definition ; however, some authors make no...

of even illumination (circle of no vignetting

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

Extension tube

An extension tube is an accessory for cameras with interchangeable lenses, used primarily for macro photography. The tube contains no optical elements; its sole purpose is to move the lens farther from the image plane. The farther away the lens is, the closer the focus, the greater the...

; however, this does not eliminate the vignetting problem, and also removes the lens's ability to achieve infinity focus

Infinity focus

In optics and photography, infinity focus is the state where a lens or other optical system forms an image of an object an infinite distance away. This corresponds to the point of focus for parallel rays. The image is formed at the focal point of the lens....

.

The 10D

Canon EOS 10D

The Canon EOS 10D is a discontinued 6.3-megapixel semi-professional digital SLR camera, initially announced on February 27, 2003. It replaced the EOS D60, which is also a 6.3-megapixel digital SLR camera. It was succeeded by the EOS 20D in August 2004....

, D60

Canon EOS D60

The Canon EOS D60 is a discontinued 6.3 megapixel digital single lens reflex camera body, announced by Canon on February 22, 2002. It is part of the Canon EOS range, and accepts Canon EF, TS-E and MP-E lenses, but not Canon's later digital-only EF-S lens range.The EOS D60 sits in the prosumer ...

, and earlier cameras share the EF

Canon EF lens mount

-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.

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 backward compatible with the EF mount, and can therefore still accept all EF lenses. As of 2011, no EF-S lens has been produced with the "L"

Canon l lens

An L lens is a line of SLR photography lenses made by Canon.L lenses are Canon's top-of-the-line lenses. The "L" officially stands for "Luxury", a reference to the lenses' high price and proclaimed build quality. The use of "ASPH" was common to notate aspherical elements throughout Canon's and...

designation or with Diffractive optics, and only one EF-S prime lens

Prime lens

In film and photography, a prime lens is either a photographic lens whose focal length is fixed, as opposed to a zoom lens, or it is the primary lens in a combination lens system....

has been produced.

Focal length Focal length The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus...	Effective focal length (×1.6 crop factor Crop factor In digital photography, a crop factor is related to the ratio of the dimensions of a camera's imaging area compared to a reference format; most often, this term is applied to digital cameras, relative to 35 mm film format as a reference. In the case of digital cameras, the imaging device would be a... )	Aperture range Aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are,...	Mark Mark (designation) The word Mark, followed by number, is a method of specifically designating a standardized, integrated, assumed to be functional and unique version of a mechanical and/or electrical hardware product that has completed the design process and has been approved to be put into final production, as well...
10–22mm Canon EF-S 10-22mm lens The Canon EF-S 10-22mm 3.5-4.5 USM lens is a wide to ultra-wide angle zoom lens for Canon digital single-lens reflex cameras with a Canon EF-S lens mount....	16–35.2 mm	3.5–4.5
15–85mm Canon EF-S 15-85mm lens The Canon EF-S 15-85mm f/3.5-5.6 IS USM is a standard zoom lens for Canon digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 24-136mm. The EF-S mount was specifically designed for APS-C cameras....	24–136 mm	3.5–5.6
17–55mm Canon EF-S 17-55mm lens The Canon EF-S 17–55mm 2.8 IS USM is a standard zoom lens for Canon digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 27–88mm.-Praise:...	27.2–88 mm	2.8
17–85mm Canon EF-S 17-85mm lens The Canon EF-S 17–85mm 4-5.6 IS USM is a standard zoom lens for Canon digital single-lens reflex cameras with an EF-S lens mount. The EF-S designation means it can only be used on EOS cameras with an APS-C sensor released after 2003. The field of view has a 35 mm equivalent focal length of...	27.2–136 mm	4–5.6
18–55mm Canon EF-S 18-55mm lens The Canon EF-S 18-55mm lens 3.5-5.6 is a wide-angle to mild telephoto zoom lens for digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 28.8-88mm, and it is the standard kit lens on Canon's consumer DSLRs.There have been four releases...	28.8–88 mm	3.5–5.6	I
			I (Jap.)
			II
			II (Jap.)
			IS
			IS II
18–135mm Canon EF-S 18-135mm lens The Canon EF-S 18-135mm 3.5-5.6 IS is a standard telezoom for Canon digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 29-216mm. It is the kit lens for the Canon EOS 60D and the Canon EOS 7D....	28.8–216 mm	3.5–5.6
18–200mm Canon EF-S 18-200mm lens The Canon EF-S 18-200mm lens is a superzoom lens, manufactured by Canon. It is the higher end kit lens for the Canon EOS 60D digital camera, and supplants the previous EF-S 17-85mm, in Canon's product line-up, losing 1mm off the wide end, but offering a roughly 2.5x longer telephoto end.While Canon...	28.8–320 mm	3.5–5.6
55–250mm Canon EF-S 55-250mm lens The Canon EF-S 55-250mm 4-5.6 IS lens is a telephoto zoom lens for Canon EOS digital single-lens reflex cameras with a Canon EF-S lens mount.It provides a 35 mm equivalent focal length of 88-400mm....	88–400 mm	4–5.6
60mm Canon EF-S 60mm f/2.8 Macro USM lens The Canon EF-S 60mm f/2.8 Macro USM lens is Canon's only EF-S macro lens, and also its only EF-S prime lens. Because it can only be used on cameras with a 1.6x crop factor, it is the equivalent of a 96mm lens mounted on a 35mm format camera...	96 mm	2.8

External links

The source of this article is wikipedia, the free encyclopedia. The text of this article is licensed under the GFDL.