The DVX-FI provides precise control of focus and iris. It has a unique variable-speed throttle for controlling zooms from the slowest crawl up to the fastest. Works on all camera supports, stabilizers, tripods and jibs. It is switchable between manual and auto modes. VariZoom Focus and Iris Control works with AG-DVX100B, not AG-DVX100, or DVX100A. VariZoom Focus and Iris Control works with AG-HVX200 and AG-DVX100B, not AG-DVX100 or DVX100A.