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Re: Canon EF 70-200 f/2.8 L IS... anybody own/used one?
I started out with a Sigma 2.8 but it went back to them once to tighten the rear assembly (a common prob) and twice more to try and sort the focus tracking.
2nd calibration attempt didn't improve things and they replaced it with a new lens, which was even worse.
I got Park to take that one back and I coughed up for the Canon.
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