Gain support for your camera and lens by using the LSB-388 Lens Bracket for Select Prime Telephoto Lenses from Photo Clam. This rail, which has Arca-type double dovetails, offers three points of support and attachment: One support point at the base of the camera, another at the lens's tripod foot, and the third at the front of the lens where the lens hood sits. The camera base and tripod foot attach via Arca-type clamps, and at the front, you'll find a Y-unit. Both the Y-unit and the camera's extension rod for the clamp are height adjustable while the lens foot clamp slides along the rail to accommodate the length of the lens. Each clamp on the top rail closes via its screw knob locking mechanism.