Digital Photography > Digital SLR , DSLR Lens and Accessories
Canon 70-200 f/4 L USM or Canon 70-300 f/4-5.6 IS USM
lightwave:
Also from personal experience with the Tamron, though it is an excellent lens, it just cannot match the AF speed of the Canon 70-200. So if you need fast AF, better to go for Canon L if you can compromise on that then the third party lens is good.
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