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FOCUSING - continued
Infrared Photography
The plane of sharpest focus for infrared light is slightly more
distant than its counterpart for visible light as seen through
the camera’s viewfinder. Thus, for sharpest focus in infrared
photography, adjustments must be made.
To compensate for this shift in focus, first focus the image
sharply through the viewfinder. Then, turn the focusing ring
counterclockwise until the point focused is aligned with the
red dot (or line) provided on the lens barrel. For example, in
the picture below, the lens has been focused for infinity (no)
infrared shooting. Note that when lenses having a focal length
of 50mm or less are used stopped down to f/8 or below, no
adjustment is necessary due to the large depth of field avail-
able.
Note: Some new optics using Nikon’s Extra-low Dispersion (ED)
glass, as well as reflex (catadioptric) lenses, do not require refocus-
ing for infrared photography. Refer to individual lens instruction
manuals for details.
Film-Plane Indicator
U nder various precision shooting situations, such as close-up
photography, it is often necessary to measure the film-to-sub-
ject distance to ensure the sharpest focus. The camera’s film
plane is indicated by the top edge of the figures making up the
serial number at the upper left of the camera body. Note that
these figures are 46.5mm from the front surface of the camera’s
lens mounting flange.
(bayonet mount front surface)
46.5 mm
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Camera Specifications
Weight and Dimensions
