Never used.

Designed to fit the following Nikon camera bodies only: Nikon D5, D810, D850, D4s, D4, D800E, D800, D3, D3x, D3s, D700, D2x, D2H.

Waterproof cover designed to protect your long lens from rain, sleet, snow or blowing sand.

One design fits Nikon 200mm 2.0, 300mm 2.8, 400mm 2.8, 200-400mm F4 zoom, 500mm F4, 600mm F4, and the 800mm 5.6 lens.

Sewn on the back is a window for viewing the LCD screen on your digital camera.

Special eyepiece is already included.