When DSLRs started offering HD Video recording, independent and guerilla filmmakers finally were able to afford to get out of the camcorder ghetto while taking advantage of techniques that utilize depth of field. But what they've really missed was the capability to accomplish a smooth "follow focus," which is the ability to focus from one part in the depth of field to another without causing camera movement. That's where the Okii USB Follow Focus Knob comes in handy.
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