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フィルムカメラ Nikon PhotomicF Tn FinderのPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Nikon PhotomicF Tn Finder 25 ページ。

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.