Nikon F3 High-Eyepoint - Film Plane Indicator; Infrared Focusing Index

Film plane indicator @
The film plane indicator (-e-) is engraved in white on the
top deck just behind the shutter speed dial. It indicates
t he exact position of the film plane inside the camera.
Wheneve r 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
When you shoot infrared film, note that the plane of
sharpest focus is slightly farther away than that in visible-
light
photography. As a rule of thumb, you can com-
pensate for th is shift in focus by referring to the infrared
compensation index (in the form of either a red dot or
a red line) near the focusing index on the lens barre l.
(Some lenses, including the Reflex Nikkor, do not need
compensation. )
After focusing the
image sharply through the viewfinder,
check the focused distance and turn the fo cusing ring to
the left until the red infrared compensation index lines up
with the prefocused distance. Be sure to shoot with the
appropriate filter, such as R60, etc. (In this photo ; the
subject-to-camera distance is set at 00 . )
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