Our FC-U manual focus system allows you to pull focus on your Sony EX-1 or EX-3 from the tripod handle. The FC-U consists of a rotating control handle, drive cable, and bracket-mounted gearbox for driving the clamp-on focus ring that attaches to the EX1/EX3 lens. The gearbox bracket attaches to any 15mm/19mm rods. *Rods required for assembly/operation