Thanks for the opinions regarding the 300 f4 IS. Seems like the consensus is that the IS is not quite as sharp, at least wide open, but that we are not talking about a world of difference. I think the problem may be that because of the IS I tend to try to take the easy way out and hand hold it, perhaps at too slow shutter speeds. I will have to give it more of a try with IS off and mounted on a tripod.
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