Warm Tips: This is a FULL Manual Lens, NO Electronic Contacts, your camera will not detect the lens when mounted, that's why it will show "Lens nont attached". Please switch to MF MODE in order to use this lens correctly. Tips to use our Manual Lens: 1) Attach the lenses with T-ring adaper; 2) Set the mode dial to Manual (M). | HIGH MAGNIFICATION PHOTOGRAPHIC LENS: This 420-800mm lens is a must-have telephoto lens for Nikon cameras, designed to take sharp, long-distance photos that offer greater photographic flexibility, allowing photographers to capture the moon, wildlife, and more. | WIDE COMPATIBILITY: Seamlessly compatible with a range of Nikon Models D500, D600, D610, D700, D750, D800, D800e, D810, D810a, D850, D3400, D5000, D5100, D5200, D5300, D5500, D5600, D7100, D7200, D7500 DSLR Nikon (DX),Nikon (FX),Nikon F,Nikon F(DX), Nikon (DX), Nikon (FX), Nikon F, Nikon F(DX), and more. | Professional quality: Advanced optical technology and construction with multi-layer low-dispersion glass and anti-reflection coatings produce sharp, high-quality images with vibrant colors and minimal distortion, ensuring that every detail is captured with precision. | PACKAGE INCLUDED: 1x 420-800mm Telephoto Lens; 1x T ring to F mount Adapter; 1x Lens bag; 1x Lens cloth; 1x User Manual.