This is a very quick test with the RED EPIC and a Canon lense to show how fast the AF system works while recording.
It was surprisingly good, a lot quicker than my focus puller could ever do.. He would have to measure up, lazar rule, find out what I was actually pointing the camera at.... over all. If your wanting pin sharp focus quickly... Then this is a great option. It does loose it from time time, but only in really underexposed conditions or if you are trying to focus on a flat surface with know edges or marking for the lens to snap to.
I'm going to use the AF function on my next project.
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