"Love the visual presence of DSLR HD Video, especially with your beautiful lenses at wide apertures, but dislike the lack of powered smoothness to your zoom sequences? Hard to execute an artistic expression with one hand supporting lens and zoom action simultaneously, isn't it?Attach a Flashpoint Zoom Lever Gear Ring to your lens and gain control to imitate the zoom effect you were missing. Simply slip the grooved collar around the lens barrel zoom ring, tighten the knurled chrome bar for a snug and secure fit and use the leverage to rotate at any desired rate. The inexpensive arm acts as an extension to the zoom ring and enables delicate, careful rotation for wonderfully slow or snappy high speed change of view.But why stop there? This 'lil lever can act as a fine focus control lever as well, providing the same delicate, sensitive extension to manual adjustments.Use two Flashpoint Zoom Lever Gear Rings! One for zoom and one for focus. The ultimate solution for DSLR cinephotographers.|Tough ridged gear teeth|Right or left hand mounts|Fits virtually any diameter lens barrel|Positive tightening action grips barrel safely"