Nikon Diopter -4.0 Correction Eyepiece for D50/70/70S/100/200, N50/60/65/70/80/6006, Pronea, FM10 cameras Optimizes your SLR viewfinder's sharpness to your eyesight Provides a -4.0 diopter value Compensates for nearsightedness For Nikon D50, D70, D100, N50, N60, N65, N70, N80, N6006, Pronea, FM10 cameras