Fotodiox Follow Focus Handles, Kit of 3 - Black, Red, Clear;

A smooth zoom or follow focus is necessary when filming and the Fotodiox Focus Handles are perfect for this. The silicone rubber rings are stetchable and have seven holes that allow the photographer to adjust the handles to fit just about any diameter lens. The slim design allows for multiple handles to be used on the same lens to give the photographer total control over zoom, focus and even aperture! The molded grooves on the handle and the ribbed portion of the stretchable rubber help grip the focus/zoom/aperture ring of the lens and prevents the Focus Handle from shifting.