A direct replacement for the Nikon DK19 Eyecup. The ProMaster 1217 eyecup has a soft cushion surrounding it for comfortable viewing, especially for eyeglass wearers. It helps to shield light, making it easier to see the viewfinder. This eyecup assembly includes 3 pieces. The soft, silicone shield and metal retainer ring work together to hold the eyecup securely on the camera. There is also a clear, optical glass eyepiece housed in a metal ring with knurled edges. This smaller ring is a replacement for the Nikon DK-17. It works in conjuntion with the soft eyecup and retainer ring to form a complete assembly that can simply be screwed into the round, threaded eyepiece socket on the camera. Please see the specifications for a list of compatible cameras. Replacement eyecup for Nikon DK19. Fits Nikon: D500 D700 D800 & D800e D810 & D810A D850 Df D3, D3s, & D3x D4 & D4s D5 D6 F6 ES-1