Infrared focusing index – Nikon Camera F3AF User Manual
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Infrared Focusing Index
The red dot beside the focusing index on most lenses is the
infrared focusing index. When shooting with black-and-white
(but not color) infrared film, it is necessary to refocus the lens to
compensate for the fact that infrared light rays focus at a point
slightly in front of visible light.
In infrared photography, use of the R60 filter is required. At first,
focus on your subject through the viewfinder by rotating the lens
focusing ring ® without the filter in place. Then look at the lens
and take note of the focused distance. Reset the focusing ring
so that the desired distance is aligned with the red dot. Finally
take pictures with the filter attached.
Note:
Automatic focusing is impossibie in black-and-white infrared
photography.
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