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I had a chance to use a friends 75-300 non IS version for a few weeks, it was quite quick to focus and was acceptably sharp but only acceptably. Remember that the more expensive IS lens has exactly the same optics as the two cheaper versions. In the end I opted for the Sigma 70-300 APO, it is noticably sharper though a tad slower to focus and has a bit noisier motor.
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