1. High‑quality alloy body with strong texture, exquisite appearance and fine craftsmanship. 2. The 900mm telephoto lens is a good choice for shooting birds and wild animals as well as ultra‑long distance shooting. 3. The mirror design greatly reduces the size and weight of the lens, making it more convenient to use and carry. 4. 8 groups of 8pcs optical structure, multi‑layer MC coating can suppress lens flare and ghosting, improve contrast and color authenticity. 5. The large aperture of F8 greatly increases the amount of light entering in order to obtain a more and safe shutter time. 6. Can be used with all for Nikon AI mount cameras, including D850, D810, D800, D780, D750, D500, D7500, D7200, D5600, etc. Specification: Item Type: Camera Mirror Lens Material: Alloy + optical glass Color: As Pictures Shown Weight: Approx. 1008g/35.6oz length: 900 mm Aperture: F8 Mount: for AI mount Applicable model: for Nikon AI mount SLR camera Optical structure: 8 groups of 8pcs Perspective: 3 ° Coating: multi-layer MC coating Front filter size: 105mm/4.1in Focus mode: manual focus Anti-shake function: none Closest focusing distance: 3.5m Applicable scene: landscape, architecture, characters, , tourism, business, sports, wedding, humanities, etc How to use： 1. Align the identification point of the lens mount with the identification point of the adapter ring, and rotate it clockwise. When you hear a click sound, it means that the lens has been installed in place 2. Align the identification point on the lens adapter ring with the adapter ring to the identification point on the fuselage, and rotate clockwise when you hear a click sound, it means it is installed in place 3. Press and hold the camera lens release button and rotate it counterclockwise to remove the lens together with the adapter