The Nikon DK-20 Eyepiece is a replacement rubber eyecup designed for select Nikon DSLR cameras. It attaches securely to the camera viewfinder to improve viewing comfort while helping reduce stray light interference during shooting sessions.

Its soft rubber construction provides cushioning around the eye area, making it suitable for extended photography use. The eyepiece is ideal for photographers using optical viewfinders in outdoor, travel, portrait, or general shooting environments where stable and comfortable framing is important.