Buy from Amazon : br br Varizoom Programmable Remote Electronic Focus Control for CanonFujinon Lenses br br Programmable remote focus control for most Canon and Fujinon lenses br Full manual mode lets user make fine focus adjustments from a distance br Programmable mode offers up to 4 quick-change positions br Easy-to-read LCD readout includes 20-foot extension cable br Rechargeable battery weighs 175 pounds 2-year warranty