Emax FocusShifter DSLR Follow Focus & Rack Focus

FocusShifter is a stand-alone Follow Focus and Rack Focus with a focus marker board that can be used on any camera lens. No extra equipment is required. It's perfect for filmmakers, photographers, and anyone wanting to step-up their production capabilities with an inexpensive focus puller. It gives you professionalism without breaking your budget. The Shifter and Focus Marker Board attach quickly and easily to any lens ranging in diameter from 56mm (2.20in) up to 98mm (3.86in). If you're measuring circumference, distance around the lens, it fits from 176mm (6.93in) to 308mm (12.12in). It even works well on the popular Canon 50mm f1.8 lens, which is notoriously difficult to attach a follow focus to due to the design of the focus ring. Note: The "mm" markings on the lens are not the outer diameter of the lens. You must measure the outer diameter.