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| Re: New Sigma 24-105mm f/4 OS Art |
The two issues aren't related- not really. Canon's MA function accounts for minor variation, not the kind of issues that Sigma (and other make) lenses seem to regularly exhibit. Accuracy is one thing, consistency is another; and the dock doesn't fix that automatically either.
The dock and MFA help with accuracy, which can potentially be extremely far off. There is no reason that only one sigma would need it and not others.
Precision is something else as you say, but that isn't related to what you first wrote.