This L lens is optimized for 35mm film and full-frame digital, and of course works on 1.3x and 1.6x Canon cameras.
This Canon EF EOS 70-200mm f/2.8L works perfectly with every Canon EOS camera ever made, meaning every Canon DSLR and every Canon autofocus EOS 35mm SLR made since 1987.
This means of course it works great on today's 5D Mark II and Canon 7D, but it works just as well on my original Canon EOS 620 from 1987!
As a full-frame lens, this works on all Canon
SLRs, regardless of format.
Optics
18 elements in 15 groups.
4 elements of magic UD glass.
Internal focus and internal zoom; nothing moves externally as focused or zoomed.
Focal Length
70~200mm.
On 1.3x Canon cameras it will see angles-of-view similar to what a 90~260mm lens would see on a 35mm camera.
On 1.6x Canon cameras it will see angles-of-view similar to what a 115~320mm lens would see on a 35mm camera.
http://www.kenrockwell.com/canon/lenses/70-200mm-f28.htm