Reviews and Problems with Canon EF 300mm f/2.8L IS USM
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One of Canon's best
7 July 2013
Summary: I could give it a 5 but nothing is perfect. The EF 300 is still a heavy lens although you can handhold it in good light. This lens is very sharp and you won't be disappointed. This lens works well with the Canon 1.4 and 2 x extenders so it gives you some options in terms of possible focal lengths. This lens is just incredibly sharp and if you can afford it, well worth the expense.
Summary: This lens is a compromise, which is not a bad thing. Especially since it is a very, very, good compromise. It is light enough to carry and hike with, small enough to go in your carry-on on a regular airliner, long enough for many (not all) wildlife photography tasks, and fast enough to function well in low light, or to keep functioning reasonably well with teleconverters. I find it an especially good "big gun" to take when traveling by air.
Pros: light weight and compact for a super telephoto. Superior sharpness.
Cons: price, you do need the teleconverters for wildlife photography, not long enough for birds (except big tame waterbirds).