Feature:1. Highquality 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 ultralong 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, multilayer 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 reliable 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 LensMaterial: Alloy + optical glassColor: As Pictures Shown Weight: Approx. 1008g/35.6ozFocal length: 900 mmAperture: F8Mount: for AI mountApplicable model: for Nikon AI mount SLR cameraOptical structure: 8 groups of 8pcsPerspective: 3 Coating: multi-layer MC coatingFront filter size: 105mm/4.1inFocus mode: manual focusAnti-shake function: noneClosest focusing distance: 3.5mApplicable scene: landscape, architecture, characters, insects, tourism, business, sports, wedding, humanities, etcHow 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 place2. 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 place3. Press and hold the camera lens release button and rotate it counterclockwise to remove the lens together with the adapter ring4. Install the adapter ring release button and rotate it counterclockwise, the adapter ringcan be removed from the lens.Package List:1 xMirror Lens1 x Adapter Ring1 x Storage Bag1 x Manual1 x Wrench