Nikon DG-2 2x Eyepiece Magnifier for Nikon D7000, D3100, D300S, D700, D90, D3X, and D3000 Digital SLR Cameras

Provides 2x magnification of the central portion of the finder imageUseful for critical focusing in close-up workIncludes an eyesight adjustment
Product DescriptionProvides 2X magnification of the central portion of the finder image. Eyesight adjustment provided. Useful for critical focusing in close-up work. (DK-18 required for Cameras with a 22mm round high eye-point viewing eyepiece thread, including: F3HP (with DE-3 High Eyepoint Finder) & F3T, F4, F5, F6, F100, N90, N90s, N8008,

Source: Digital Camera and Video Store...