Comments about Nikon Nikon DK-17C, - 3.0 Diopter Correction Eyepiece for D3, D2H, D2X, D2Xs & F-6 SLR Cameras:
Nice to use when you have glasses....just screw this into the finder piece and take off your specs....(provided you are as nearsighted as me) and then camera composing is a lot easier!