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Old Sep 3, 2008, 8:58 PM   #5
Senior Member
Join Date: Oct 2004
Posts: 278

Funny you asked. I abandoned the ai servo mode, too many failure rates with the xt and xti, I went back to single shot mode, focus it is a little better. But I sometimes find tracking a subject I can't get the focus to lock, this is what brings my blood to boil, those missed moments, I find more success with the L lens with a 2x or 1.4x conv. I did try to test my sigma lens today, focus did well, except that it back focused when the subject had surrounding clutter. This did not happen with the Canon L. thanks for your time nhl
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