The VP-350 Telephoto Lens Support Quick Release Plate from Sirui enables you to mount a camera with a telephoto lens on a Manfrotto quick-release equipped tripod. The camera attaches to the standard 1/4"-20 mount Arca-type quick release on the upright support while the foot of the telephoto lens attaches to the horizontal bed via its 3/8"-16 and 1/4"-20 mounting studs. With three mounting points, plus a rubberized non-slip surface, the chances of unwanted camera movement are reduced significantly. To aid in lens alignment there is a spring-loaded alignment pin incorporated into the lens plate.