Specification:Condition: 100% Brand NewItem Type: Lens Mount RingMaterial: Metal(Aluminium Alloy)Color: BlackQuantity: 1PCSWeight: Approx. 173gCircle Inner Diameter: Approx. 81mm/3.19inchCircle Width: Approx. 1.75cm/0.69inchSuitable Lens: (Compatible Following Lens)For TAMRON SP 70-300mm f/4-5.6 VC USDA005 For Sony 70-300mm f/4.5-5.6G SSMSAL70300G For Nikon AF Zoom-Nikkor 80-200mm f/2.8D EDInstructions for using: 1. An accessory that enhances stability when shooting with a large telephoto lens and using a tripod. Mounted on the lens barrel, the lens is fixed to the tripod through the tripod mount hole below the tripod mount ring. In addition, simply loosen the rotation lock knob of the tripod mount to rotate the camera around the lens, and you can switch between vertical and horizontal composition without tilting the gimbal. Attaching and removing the tripod ring Follow the procedure below to attach the tripod ring and follow the reverse procedure to remove the tripod ring.2. Turn the lock knob counterclockwise to align the arrows with the dot. Then pull the knob outward to open the ring.3. With the ring open, place the lens in the tripod ring. Loosen the lock knob of the tripod ring, you can turn the camera and lens mounted on the tripod, freely switch between the horizontal and vertical shooting directions. After turning the camera to the desired position, tighten the lock knob. The tripod ring can be used on the ring tripod head.Package List:1 x Lens Mount Ring