<p>I'm in the same predicament considering lens choice and future upgrade to D700. My understanding from the masses of reviews and reports I have read is that the 70-200 f2.8 smashes the 70-300 on IQ and AF speed and accuracy. However, the gap between the two lenses closes considerably when comparing performance on the full frame D700 due to the 70-200's vignetting and image softness. </p>
70-200 f2.8 vs 70-300 VR
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