and a 2x TC will not AF unless you have a 1D camera, the 1.4x "should" with the tape trick but its horribly slow
the 70-300IS is an ok lens but for the price the 70-200 F4 Non IS is much better
I had the 70-300IS and I got rid of it and got the 100-400L
and there is no such thing as a 70-200 sigma for 200-300 bucks for a canon mount that I have ever seen, the only 70-200 they have is a 2.8 and its 750 bucks
and I dont think you realize that a 2x TC will double your shutter speed, you have no chance in hell of using it at night unless your taking pics with a good tripod and its a stationary object
and the IQ will be hurt quite a bit as well at the best of times, at night forget about it
the 70-300IS is an ok lens but for the price the 70-200 F4 Non IS is much better
I had the 70-300IS and I got rid of it and got the 100-400L
and there is no such thing as a 70-200 sigma for 200-300 bucks for a canon mount that I have ever seen, the only 70-200 they have is a 2.8 and its 750 bucks
and I dont think you realize that a 2x TC will double your shutter speed, you have no chance in hell of using it at night unless your taking pics with a good tripod and its a stationary object
and the IQ will be hurt quite a bit as well at the best of times, at night forget about it
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