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Optional Nikon eyepiece diopters allow you to optimize your SLR viewfinders sharpness in conjunction with your individual eyesight. Nikon SLR cameras without built in adjustable eyepiece correction have a base diopter value of minus one. Minus one is considered the optimum starting point for the majority of SLR users with normal vision. The combination of the cameras viewfinder components and a clear standard eyepiece form a virtual image of a subject on the cameras focusing screen that is the approximate equivalent of a viewing distance of one meter.
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