Film Plane Indicator; Infrared Focusing Index - Nikon F3AF Instruction Manual

Film Plane Indicator
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The film plane indicator (
-E>- )
is engraved in white on the top deck
just behind the shutter speed dial. It indicates the exact position
of the film plane inside the camera. Whenever it becomes
necessary to measure the exact distance between the subject
and. film plane, such as in macrophotography, use the film plane
indicator. The distance between the film plane and the lens
mounting flange is exactly 46.5mm.
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
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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 impossible in black-and-white infrared
photography.
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