AF inconsistencies is a results of not-well-calibrated lens and bodies. The differences in lens optical shifting can also send the bodies AF sensor and AF firmware to North Pole anytime. With Sigma, you might have another variable since their lenses motor step was mapping one-to-one to each individual canon bodies AF driver. So, the chances to find a good sigma lens is always harder than a canon one because of those reasons and that does not mean they don\'t exist.
Mar 23, 2013 at 07:12 PM
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