【Super Telephoto Lens】Manual focus telephoto lens, a focal length of 420-800mm and an aperture of F/8.3-16 (non-adjustable aperture value, f8.3 at 420mm and f16 at 800mm), filter size of 62mm, full frame, F mount, built with high-quality materials and robust construction, making them durable and long-lasting; | 【Upgraded version】Upgraded into an F mount, which can be mounted on Nikon DSLR cameras without connecting the T adapter ring. For those who photograph wildlife or the moon as a hobby, this lens would be a great choice; | 【F Mount Compatibility】Compatible with Nikon D-series DSLR cameras: D850 D810 D810A D800 D800E D780 D750 D700 D610 D600 D500 D300 D300S D200 | D7500 D7200 D7100 D7000 D5600 D5500 D5300 D5200 D5100 D5000 D3500 D3400 D3300 D3200 D3100 D3000 | D100 D90 D80 D70 D70S D60 D50 D40X D40 | D6 D5 D4S D4 D3S D3X D3 D2XS D2X D2H D1X D1H D1; | 【Manual Focus】The lens has a focus ring located near the front. Manually rotate this ring to adjust the focus. Turn the ring slowly until the subject you want to focus on appears sharp and clear. | 【NO electronic contacts and No Autofocus Motor】Manual lenses lack electronic contacts, so you need to use our lens in Mode M. On manual lenses, the camera may display F-- because it doesn't have direct access to the aperture value.