Nikon DK-17C 0.0 Correction Eyepiece for D2H, D2HS, D2X, D2XS, D3, D3S and D3X
The Nikon DK-17C (0) Eyepiece Correction Lens enables you to optimise the sharpness of your SLR viewfinder in conjunction with your own eyesight.
Cameras without in-built adjustable eyepiece correction have a base diopter value of -1 which is thought to be the optimal starting point for SLR users with good vision. The components of the camera's viewfinder combined with a clear (standard) eyepiece form a virtual image of the subject that is the approximate equivalent of a viewing distance of one meter.
The numerical value of an eyepiece is represented by either a minus value (nearsighted) or a plus value (farsighted). The base diopter value does not affect the end value thus if you require a diopter of 0 this eyepiece is the right choice for you.