Nikon 25446B D90 User's Manual - Page 52

Adjust Viewfinder Focus The camera is equipped with diopter adjustment to accommodate individual differences in vision. Check that the display in the viewfinder is in focus before X framing pictures in the viewfinder. 1 Remove the lens cap and turn the camera Power switch on. 2 Focus the viewfinder. Rotate the diopter control until the viewfinder display and focus point are in sharp focus. When operating the diopter control with your eye to the viewfinder, be careful not to put your fingers or fingernails in your eye. Focus point A Eyepiece Correction Lenses Corrective lenses (available separately; pg. 239) can be used to further adjust viewfinder diopter. 32