Vktech DK-23 Rubber Eyecup Eyepiece for Nikon D7100 D300 D300S D5000 DSLR Camera The DK-23 rubber eyecup improves viewing comfort and prevents stray light from entering the viewfinder and diminishing contrast The Eyecup provides cushioning around the camera's eyepiece, and is especially useful to eyeglass wearers Minimizes the amount of stray light that enters the viewfinder Lightweight, durable, very easy to use Compatible with: Nikon D300 D300S D5000 D7100