Nikon Dioptre Eyepiece Correction -4 for Select Nikon SLR and DSLR Cameras

Nikon -4 Diopter Eyepiece Correction for D90, D3100, D7000, D300s, F80, D100, D300, D80 and D40. The Nikon eyepiece diopters allow you to optimise your SLR viewfinder's sharpness in conjunction with your individual eyesight. Eyepiece diopters are designed for specific camera models and are identified by a plus, a minus or a neutral numeric diopter value.