| http://www.w3.org/ns/prov#value | - it is so sharp that you can use a 1.4x teleconverter with it without too much of an IQ penalty.- Canon 70-200 f/4L IS is the best choice if your budget is a bit smaller, if you do not need f/2.8 too desperately (for low light shooting or extra high background blur portraits), or if the weight from the f/2.8 is an obstruction (1.3kg vs 760g for the f/4L IS version).
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