Canon EF 70-300mm f/4-5.6L IS USM Lens Review at Ephotozine.

Of all the 70-300mm lenses in existense, this is the most expensive one. Is it worth the (hefty) premium?:

"Typical of Canon's L series lenses, this lens feels incredibly well-built and the tough white exterior finishes off the look. Sealing against dust and moisture has been applied to the lens, including a rubber gasket around the metal lens mount to

prevent the ingress of moisture and particles into the camera body. Despite the excellent build, this lens isn't massively heavy, thanks to the moderate f/4-5.6 max aperture, and it weighs 1050g. As a result the lens balances well on the EOS 5D MKIII used for testing even without a battery grip attached."

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