[Instructions for use] A tripod mount accessory designed to enhance stability when using a large telephoto lens with a tripod. Mount the ring onto the lens barrel and secure the lens to the tripod via the tripod socket located beneath the tripod mount. The camera can be rotated around the lens axis by loosening the rotation lock knob on the tripod mount, allowing quick switching between portrait and landscape orientations without tilting the gimbal. To attach or remove the tripod ring: Turn the locking knob counterclockwise to align the indicator mark, then pull the knob outward to open the ring. With the ring open, position it around the lens. To rotate the camera and lens for horizontal or vertical composition, loosen the tripod rings locking knob, adjust to the desired position, then tighten the knob securely. This tripod ring is compatible with a circular tripod head. Constructed from aluminum alloy with a one-piece body design and CNC precision machining for durability and wear resistance. Precision all-metal construction with surface hardening treatment provides a smooth, durable finish. The inner surface features a flocked lens holder with a locking knob that securely fits the lens without gaps, ensuring a stable and reliable connection. Includes a 1/4-inch threaded tripod socket at the base. [Basic function] Securely mounts the lens to a tripod and allows smooth rotational adjustment for optimal composition. Specifications: Inner diameter: 81mm Width: 18mm Compatible lenses: FOR SP 70-300mm f/4-5.6 USD (A005) FOR 70-300mm f/4.5-5.6G SSM (SAL70300G) FOR AF Zoom-Nikkor 80-200mm f/2.8D ED Color: Black Material: Aluminum alloy Package Contents: 1 x Tripod Mount Ring Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement tolerance: +/- 1-3 cm.