Reviews and Problems with Canon 200-400mm f/4 IS USM Extender 1.4x
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Edgar Betancourt "HD Lover", Amazon
7 December 2013
Summary: Excellent optics, beyond ridiculous price. This lens offers optics broadly equivalent to the Nikon 200-400 but costs almost twice the price. That is insane. Whilst with this lens you're stuck with a 1.4 teleconverter the Nikon can use up to a 2.0 and still autofocus using a d800 or a d4 and get, again, almost identical quality as with this lens using a 1.4 internal converter.
Summary: May I say up front that were the 200-400 priced at, say, $7000 I would suffer no such ambivalence. Given a $12k tag, I can't escape having mixed feelings about the 200-400. I do not own this lens but rented the lens for one week from a trusted rental house in Cordova TN. My rental served, in part, as a pre-purchase audition. Our rental lens was used for one week shooting dog water rescue testing in available light.