Nikon PhotomicF Tn Finder, Инструкция по эксплуатации

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Lens Aperture Coupling
The Photomic FTN takes advantage of the automatic diaphragm feature
of Nikkor lenses to measure light with the lens wide open. Full-aperture
metering gives a bright, clear finder image for viewing and focusing and
minimizes the effect of light entering the viewfinder from the rear.
In order for the meter to measure exposure at full aperture with lenses of
different maximum aperture, it must be coupled with the maximum ap-
erture of the lens in use. This is done each time the lens is attached or
changed by turning the aperture ring of the lens through its entire range.
With the lens mounted on the camera, twist the aperture ring counter-
clockwise, then clockwise as far as it will go. This meshes the coupling
prong on the lens with the pin on the Photomic FTN Finder and adjusts
the meter for the maximum aperture of the lens.
The adjustment can be verffied by checking the maximum aperture scale
on the front of the finder. The scale has a range from f/1.2 to f/5.6. For
example, if the 50mm f/1.4 lens is mounted on the camera, the red index
mark should appear between 1.2 and 2.8.
For instructions for mounting and removing lenses, see the Instruction
Booklet for the Nikon F.