Quote:
Originally Posted by Jonathan Farmer
Remember that the Sigma f/2.8 should work with the 2X TC and maintain AF but the Nikon f/4 will not. Personly I would be tempted to go for the Sigma; I am a glutten for speed. Try to get some other feed back on the Sigma, if it is a prime lens and not a Zoom, I think it will be your best bet.
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Another option at a similar price is the Sigma 120-300 f2.8, this is supposed to have near identical AF speed and IQ to the 300 f2.8 prime, but with the flexability of a zoom. I do know someone who tested both a felt that the IQ of the zoom was better than the prime, it was sharper wide open!