Focusing — continued – Nikon EL2 User Manual
Page 33
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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 fo
cus 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 fo
cused 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
(°°)
infrared shooting.
Note that when lenses having a focal length of 50mm
or less are used stopped down to f/8 or below, no ad
justment is necessary due to the large depth of field
available.
Note: Some new optics using Nikon’s Extra-low Dispersion
(ED) glass, as well as reflex (catadioptric) lenses, do not require
refocusing for infrared photography. Refer to individual lens
instruction manuals for details.
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