I have to agree with Jeff to a point. It depends on what you are doing with your pictures.
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<p class="MsoNormal"]I actually have the 70-200 f/2.8L IS lens, 1.4X and 2X. I
use it for sports and it is a fine lens indeed even with the 1.4X. Not so good
with the 2X however. If you are
publishing say to a newspaper then the 2X is OK. I included a shot I took with the 300 f/4 because from
the penalty box it is a perfect focal length for <st1lace w:st="on"]<st1:city w:st="on"]action</st1:city></st1lace> around the net and no extender is
needed. And it's a prime. The IQ of the 300 w/o and extender is better than the 70-200 zoom with
one, IMHO. The pro I learned from uses a 300 f/2.8 and before he could afford
it he used the 70-200 with a 1.4X, and made a nice (newspaper) living. However his 300
f/2.8 can go everywhere without an extender and the IQ is about as good as it gets.
BUT it's $4000. Not sure about the IQ of the 100-400 because I don't own one, but I remember reading that the results were mixed at best.
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