johnctharp Offline Upload & Sell: Off
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Gochugogi wrote:
True, plus most video is shot with outboard audio to at least an external mic so focus noise isn't a problem (built-in audio is pretty terrible). I listen to the guide tracks before syncing audio and noticed both my STM lenses--40 2.8 and 24 2.8--make focus noise that is picked up by my 70D's mic. And, oddly, the 15-85 IS USM is silent during focus. My 10-22 USM sounds like a cross between a stuttering soprano and chimp.
Technically, the pancakes have smooth focusing, but aren't supposed to be quiet. The STM zooms are supposed to be better, but generally the newest USM lenses are just as smooth.
Of course, all of that assumes that you'd actually want to AF during video, and generally speaking, production quality standards prevent that in most situations. So if you're not worried about smooth AF and you're using off-board audio recording, literally any lens that covers the frame will do. Canon's 'wax-coated' video feed and antiquated codecs do more to degrade the quality of the video that their DSLRs produce than the IQ issues most lenses would present.
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