JJC EN-5 Eyecup Assembly allows for more comfortable viewing through the camera's viewfinder, especially for eyeglass wearers. Less stray light enters the viewfinder and a less flared, clearer image with which to compose your shot is provided. The eyecup assembly is made of soft silicone. The ergonomic design will fit your eyes better. JJC EN-5 includes a eyepieces with optical glass and a eyecup which replaces Nikon DK-19. You can still use this eyecup even if you lose the original camera eyepiece. The EN-5 Eyecup Assembly installs easily.and is compatible with Nikon D5, D500, D810A, D810, Df, D4S, D800E, D4, D800, D2 Series, D3 Series, etc.