Infrared focusing index – Nikon F3 User Manual
Page 44
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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 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. To use the
index, first focus on your subject through the viewfinder.
Then look at the lens and take note of the focused dis
tance. Finally reset the focusing ring so that the desired
distance is aligned with the red dot.
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