The Nikon DK-17M is a Magnifying Eyepiece for Nikon D2H(s), D2X(s) F6, D3 and D3X.(the eyepiece will mount to Nikon cameras that accept the round screw-on eyepieces). The DK-17M replaces the stock DK-17 eyepiece that comes with the camera, and increases the viewfinder magnification by approximately 1.2x. This gives DX DSLR users the feel of the full-frame viewfinders on film/FX based cameras.
Price from: $37.95 USD
Manufacturers web site: www.nikon.com
The DK-17M gives you the feel of the full-frame view on a DX sized Dslr camera. It also helps problems associated with difficult viewing through a helmet, goggles etc. A must have item, when you have tried it once there is no way back. As you can see in the picture below, the eyepiece does stand out a bit compared to the stock one. I actually really like that, as my nose is less squeezed against the LCD screen.
*Prices are subject to change. Listed price is from July 31, 2009