Canon EF 70-200mm 1:2.8 L IS USM review
The 70-200m F2.8 is one of Canon's L series professional quality lenses, and therefore built to the very highest standards. The construction appears to be essentially of metal, and the internal focus and zoom design gives a sense of robustness and solidity to the 'one-piece' design which few other lenses match. The lens is moisture and dust resistant, and incorporates a rubber 'O'-ring around the mount to provide a seal with the camera body. The striking off-white colour to is apparently designed to reduce the effects of heating under direct sunlight (and quite possibly not without some degree of marketing value).
The lens is pretty typical in size for its class, and therefore potential upgraders should appreciate that it's significantly larger and heavier than consumer telezooms such as the 70-300mm F4-5.6 IS USM. This therefore may well not be a lens you'll want to carry around all day when on a hike though the jungle, for example.
On the camera
This is a sizeable lens, and therefore handles best on larger bodies such as the 1D(s) series, although it still works very well on intermediate bodies such as the 5D and 40D. The balance of the lens is excellent, and the zoom ring is positioned perfectly towards the centre of gravity of the lens/body combination; however a distinct shift in grip is required to operate the manual focus ring. Perhaps surprisingly, the lens also proves to be reasonably workable on compact EOS bodies such as the 450D, by holding the combination primarily by the lens and treating the camera essentially as a glorified rear lens cap.
This lens features Canon's ultrasonic motor for autofocus, which performs extremely well; it's practically silent in operation, and we saw no evidence of any systematic focusing errors. We found focusing to be extremely fast and accurate in everyday use on all of the bodies used for testing (ranging from the entry-level EOS 450D to the top-of-the-line EOS-1Ds Mark III), however it must be noted that focus speed and accuracy is dependent upon a number of variables, including the camera body used, subject contrast, and light levels.
Lens body elements
Reported aperture vs focal length
This lens allows an aperture range from F2.8 to F32 at all focal lengths.
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