Wow
Originally Posted by
Kayaker72
I am pretty excited about the 70-300 mm f4.0-5.6 IS. I've been seriously considering buying the 70-200 mm f/4 IS. If the IQ is similar,the extra 100 mm for a few hundred dollars may be a bargin. And I was also looking at both extenders
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Keep in mind that you're getting 100mm but your losing a stop of light, going from f/4 to f/5.6. An f/5.6 apertureat the long end means if you add one of those new extenders (or an old one) to this new 70-300mm L, you will lose autofocus capability unless you have a 1-series body (and even a 1-series body will not AF with this new 70-300mm L + 2x Extender, since that will be f/11 at the long end).
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