Source from http://www.dpreview.com/lensreviews/canon_70-200_2p8_is_usm_c16/
The EF 70-200mm F2.8 L IS USM was introduced way back in August 2001, supplementing (but not replacing) the non-stabilized 70-200mm F2.8 L USM in Canon's highly regarded telephoto lineup. This is a lens which can truly be described as a professional workhorse, with robust build (including dust and moisture resistance), wide F2.8 maximum aperture, fast and silent ultrasonic autofocus motor, and optical image stabilization for hand-holding at slow shutter speeds. The optical design is somewhere on the far side of complex; it features 23 elements in 18 groups, with 4 UD elements to provide compensation for chromatic aberration. According to Canon, this gives a 'high-resolution, high-contrast optical capability', as demanded from a lens which needs to perform all day, every day in the hands of professional photographers across a wide range of subjects and conditions.
The 70-200mm is an EF lens, and has presumably been designed from the outset for optimum performance on Canon's professional 1-series DSLRs, with their full-frame 35mm and 1.3x crop (APS-H) formats (indeed the original EOS-1D was announced just a month after this lens, with the full-frame EOS-1Ds following a year later). However it's also fully at home on all of Canon's APS-C DSLRS, here providing a 112-320mm equivalent angle of view.
Here are some photos which taken by using canon 70-200mm f2.8 L IS USM lense from http://www.flickr.com/
More photos at http://www.flickr.com/search/?q=Canon+EF+70-200mm+F2.8
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