Canon EF 70-200mm lens

The EF 70-200mm lens is a telephoto zoom lens made by Canon Inc.The lens has an EF mount to work with the EOS line of cameras.

The lens comes in four different versions. All four have a constant maximum aperture over the whole focal range and all four are L-series lenses.
*2.8L IS USM
*2.8L USM
*4L IS USM
*4L USM

All four lenses have an excellent reputation for providing optical quality comparable to various prime lenses at all focal lengths in the zoom range. The f/4 non-IS version, the most inexpensive L-series lens that Canon makes, is popular among weight-sensitive landscape photographers and hobbyists who want L quality without spending thousands of dollars, while the f/2.8 versions are popular among event and portrait photographers and photo-journalists. The IS-equipped lenses use circular-bladed diaphragms which maintain a nearly circular aperture when stopped down by up to two stops. They are also sealed against dust and water when coupled with one of Canon's weather sealed DSLR cameras. These lenses are compatible with the Canon Extender EF teleconverters.

Crop factor

When used with a Canon APS-C Digital SLR, such as the EOS 400D or EOS 40D, the effective apparent focal length of the Canon EF 70-200mm lens is 112-320mm. This is due to the crop factor inherent with non-full frame digital SLR cameras.

witches

The most frequently pointed-out problem with this lens is the placement of the IS and AF buttons, that makes them prone to accidental flipping during hand-held shooting. Some photographers solve this simply by covering the buttons with a piece of gaffer tape. In recognition of this issue, the most recent of these lenses (the f/4L IS USM model and recent f/2.8L IS USM lenses) uses switches designed to reduce the incidence of accidental switch activation [http://www.canon.com/camera-museum/tech/report/200611/report.html#t14] .

pecifications

ee also

* Canon lenses
** Canon EF 24-70mm lens, has the same maximum aperture of 2.8 and with a 24-70mm focal range, complements the 70-200 by covering the mid-wide to mid-telephoto range below the range of the 70-200.
* Third party lenses
** Sigma 70-200mm f/2.8 EX lens

External links

* [http://www.usa.canon.com/consumer/controller?act=ModelDetailAct&fcategoryid=150&modelid=7469 Canon EF 70-200mm f/2.8L IS USM]
* [http://www.usa.canon.com/consumer/controller?act=ModelDetailAct&fcategoryid=150&modelid=7341 Canon EF 70-200mm f/2.8L USM]
* [http://www.usa.canon.com/consumer/controller?act=ModelDetailAct&fcategoryid=150&modelid=14260 Canon EF 70-200mm f/4L IS USM]
* [http://www.usa.canon.com/consumer/controller?act=ModelDetailAct&fcategoryid=150&modelid=7345 Canon EF 70-200mm f/4L USM]