I am looking for recommendations for telephoto lenses for shooting birds with the 7D. I'm not ready to leap into the high cost range of the Canon 500 or 600's.
I've been considering the Canon 400L 5.6 without IS or most likely the Canon 100-400L. I like the versatility of the 100-400 and the IS, but the 400 reportedly is a little sharper.
I've also been reading about the Sigma 50-500, 150-500 and 120-400. However, the reviews all downgrade them on the long end which is what I will use most.
Am I missing any options in the sub $2000 range? Is the Canon 100-400L the best overall choice?






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