Nikon D300 Complete Manual page 212

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Just to the right of the viewfinder eyecup you'll find a small

knob marked + ---- -. What this knob controls is the diopter

value used for the viewfinder. Diopter is a unit of

measurement that describes the refractive power of a lens.

The default value (the center click stop on the dial, where - is

exactly at 12 O'clock and + is at 6 O'clock) is set at –1

diopter, and the range that's supported directly by the

viewfinder goes from –2 diopters to +1 diopter.

In prescriptions for glasses, negative diopter numbers indicate

correction for nearsightedness. In camera viewfinders, the

diopter value controls the apparent distance at which the

viewfinder appears (the default is 1 meter away, the

equivalent of –1 diopter). If your corrected or uncorrected

vision isn't sufficiently able to focus on objects at that

distance, you'll need to adjust the diopter value.

To adjust the diopter value:

1. Defocus the lens on the camera until the scene in the

viewfinder is completely blurred.

2. Point the camera at something plain, like a clear blue

3. Look carefully at the focus area marker in the

viewfinder (or the gridlines if they're on). Are they

sharp and distinct? If not, rotate the Diopter

Adjustment knob until the focus area marker is sharp.

You may want to remove the rubber eyecup to make it

Thom Hogan's Complete Guide to the Nikon D300

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