The 1/4 20" Lens Support uses a 1/4 20" screw to screw directly into a variety of lenses for more support. This lens support clamps to the rods from underneath so it can quickly be taken off the rods. The middle rod that attached to the lens has vertical adjustment, if needed (please specify the rod size). Only thumb screw tightening is necessary, no tools required. This lens support can be used with a variety of rod sizes. Please specify the rods that are being used below for the q-mount.