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I've been using the 100-400 for about 18 months now and have been getting decent results with it (as well as some not so decent results!) Although it's not as sharp as a prime lens I find the flexibility of the zoom useful.
I did try using it with a 1.4 teleconverter and the combination struggled. So as gi_gav suggests pick up the lens first - see how it works, and then decide if you want to spend the additional money on the TC.
I'm marshalling at Silverstone on the 19th so hopefully I'll bump into a few of you around the circuit somewhere.
Last edited by neil_davidson2; 10 Mar 2005 at 09:14.
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