Optional Nikon eyepiece diopters allow you to optimize your SLR viewfinder's 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 camera's viewfinder components and a clear (standard) eyepiece form a virtual image of a subject on the camera's focusing screen that is the approximate equivalent of a viewing distance of one meter.
Each Nikon eyepiece diopter incorporates a numerical value, represented by a minus value (nearsighted) or a plus value (farsighted) number, enabling you to select the appropriate diopter for your vision and your camera model.
The eyepiece's diopter value is, when combined with the viewfinders minus one value, the end-result value. No combination of the camera's base value of minus one and a given accessory diopter's value is required to arrive at the final desired value. In other words, if you require a diopter of plus 3, simply add a plus 3 diopter to your camera.
Will this diopter fit the Nikon F and F2 camera bodies as well?
Asked by: Alan
No, this will not fit the older Nikon F and F2 cameras.
Answered by: James B.
Date published: 2018-08-27
Will this fit modern digital cameras taking the DK-17 (round eyepiece) - D810 and D500?
Asked by: Anonymous
No, it would not. Only the DK-17C series diopters are compatible for use with the Nikon D810 or Nikon D500 DSLR camera. Unfortunately, the strongest diopter currently avaialble for use on the Nikon D810 and D500 DSLR cameras would be the Nikon DK-17C -3.0 Correction Eyepiece for Select Nikon Cameras, B&H # NIDK17CM3. Combined with the built-in diopter in the camera, you should be able to obtain a -4 diopter setting. The built-in Nikon D500 diopter can be set to -2, while the built-in diopter in the Nikon D810 can be set to -3, so you should be able to reach a -4 setting with the above combination.