Nikon 500mm f4G ED VR is an Auto Focus (AF) Telephoto Prime lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 500mm. With a max aperture of f4 at 500mm, this is a moderately fast lens.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Nikon 500mm f4G ED VR is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.