eaglewolf Offline Upload & Sell: Off
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I haven't tried the 1.4X, as I have the 1.7X and 2X TC's. The 1.7X is a bit slow in low light, but otherwise works great. Trying the 1.7X with the 300 f/4 AF-S on birds in the early morning light was unsuccessful for me, as the lens just took too long to focus. Well, that and the fact that I'm most likely lousy shooting birds in the early morning light with a 510mm f/6.3 lens, but I prefer to blame it on the equipment! 
The 2X has never been on my 300, though I love it on the 70-200 f/2.8. Still, I prefer the 1.7X, though I'm not sure if that is more due to everyone here constantly ragging on what a lousy piece of glass the 2X is - I'd always enjoyed it before spending a lot of time on FM.
For the money and reach, the 1.7X is an amazing TC though. I understand the 1.4X is even better in IQ than the 1.7X, and that is saying something.
David
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