• 【Note:Manual Focus/MF】Note: This is a manual focus lens (without autofocus/AF). You need to set the camera mode to M (manual) to use. Otherwise, you will see an error "lens not attached" (you can not press the shutter when you are on the error page). More importantly, the manual lens must be manually turned to gain focus • 【Super Telephoto Lens】Manual focus telephoto lens, focal length of 420-800mm, f/8.3-16 aperture (non-adjustable aperture, f8.3 at 420mm, f16 at 800mm), filter size 62mm, full frame, F mount, high quality materials and sturdy construction, durable and long lasting • Upgraded Version: Upgrade to an F mount. Can be mounted on Nikon DSLR cameras without connecting T-adapter ring. If you are a fan of wildlife or moon, this lens is perfect for you • [Compatible with F mount] Compatible with Nikon D Series DSLR Cameras: D850, D810, D810A, D800, D800E, D780, D750, D700, D610, D600, D500, D300S, D200 | D7500 D7200 D720 D720 7100 D7000 D5600 D5500 D5300 D5200 D5100 D5000 D3500 D3400 D3300 D3200 D3100 D3000 | D100 D90 D80 D7 0 D70 S D60 D50 D40X D40 | D6 D5 D4S D4 D3S D3X D3 D2XS D2X D2H D1X D1H D1; • 【NO ELECTRONIC CONTACT, NO AUTO FOCUS MOTOR】The manual lens has no electronic contacts, so you need to use our lens with Mode M. During that time, ISO/shutter speed should be set to Mode M. Otherwise, the picture will be too bright or black. The camera may show F-- because manual lens does not allow direct access to aperture