[Instructions for use] An accessory that enhances stability when shooting with a large telephoto lens and a tripod. Mounted on the lens barrel, fix the lens to the tripod through the tripod socket under the tripod mount. In addition, the camera can be rotated around the lens by simply loosening the rotation lock knob of the tripod mount, and the portrait and landscape composition can be switched without tilting the gimbal. Attaching and Removing the Tripod Ring Follow the procedure below to attach the tripod ring and reverse the procedure to remove the tripod ring. Turn the locking knob counterclockwise to align the arrow with the dot. Then pull the knob outward to open the loop. With the ring open, place the lens in the tripod ring. Unscrew the locking knob of the tripod ring to turn the camera and lens mounted on the tripod to switch between the horizontal and vertical shooting directions. After turning the camera to the desired position, tighten the locking knob. A tripod ring can be used on a circular tripod head. Aluminum alloy material, one-piece body design, CNC precision machining, making it durable and wear-resistant. Unique design, can better protect your camera. The tripod ring is made of high-strength metal, and there is no safety problem when used with the lens. Precision all-metal material processing and surface hardening treatment, delicate, smooth and wear-resistant. The lens ring is made of all-metal material, with a 1/4 screw hole at the bottom; the inner flocked lens holder with locking knob is tightly combined with the lens, without space, and is sturdy and durable. [Basic function] Fix the lens on a tripod, which can be rotated in a convenient direction to meet the shooting needs. Ring inner diameter: 81mm Ring width: 18mm Applicable lenses: (compatible with the following lenses) FOR Tamron SP 70-300mm f/4-5.6 VC USD (A005) FOR Sony 70-300mm f/4.5-5.6G SSM (SAL70300G)