Nikon DK-21 Rubber Eyecup Nikon Digital SLR Cameras Description The Nikon DK-21 Rubber Eyecup attaches to the viewfinder eyepiece of the Nikon D750, D610, D600, D7000, D90 Digital Cameras, minimizing extraneous light and reducing vision fatigue. Features: Replacement rubber eyecup for Nikon SLRsAttaches to the viewfinder minimizing extraneous light and vision fatigue Product Details: Product Dimensions: 2.25 x 1.5 x 1.5 inches Item Weight: 6.1 ounces Item model number: 25335 Is Discontinued By Manufacturer: No Date First Available: October 2, 2001 Manufacturer: Nikon