If you shoot a busy scene with people talking and music though, you are unlikely to hear it. If you are shooting a vista without sounds for example, you will often hear the hum of the ultra-sonic motor.
Some more, some less, but they still do and it can get recorded in the audio track. So, in other words, the point of how much noise the AF system makes is moot.Ĭontrary to popular belief, ultra-sonic lenses still make noise. Quality videos are done with manual focus for these reasons. Unlike with still photography where missed focus happens between shots, a video records every attempted and missed focus the camera does. You also run the risk of the camera focusing on the wrong subject. This system needs back-and-forth movement of the lens to lock focus and this is visible in videos. But what you do not know is that Contrast-Detect AF will ruin the video track. You are right that the sound-track of videos will be ruined if it records the AF noise. As said, this is used on all DSLRs that have an AF motor.
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