B009UYK37M Opteka FF220 Rail-Free Reversible Follow Focus for Digital SLR Cameras

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Attaches directly to any camera via tripod mount, no rails needed. Adapter included to attach to 15mm rods
Completely gear-driven design for slip-free, accurate, and repeatable focus movement
1:1 gear ratio allows smooth movements for still and motion picture lenses
Adjustable slide-mounting mechanism to fit large range of lens diameters, including video camera lenses
Gear drive can be mounted from both sides for left or right hand use