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      12-14-2012, 12:38 PM   #4015
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Originally Posted by dcstep View Post
With Canon and a long lens, you simply set your camera up on a tripod, focus on something 20 or 30-ft away, then switch to Live View, 10X, then refocus (AF both times) to see if the focus changes. If it changes, then you dial in some correction and recheck all over until you get equally good focus by both methods.

Canon uses a different AF method in Live View vs. viewfinder, but I can't remember the details of why this simple test works. (It does, I've tried it). Of course, if neither will focus tack sharp, then you've got a problem.

I'll have to try that.

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