geniousc
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Buy and Sell: On
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it certainly is slower is on my D300. i shot birds all winter with 300 af-s and both teleconverters. ...maybe 20K or more shots. it is also much slower to focus on my 500 VR than the 1.4X.
If you shot 20K shots you would certainly know then, no denying that  .
However I shoot in bright sunny weather and notice very little difference and I'm talking about the 300 F4 AFS now not the 2.8. It just wasn't a big deal the difference that is.
gene
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