Depth-of-field preview button d) – Nikon Camera F3AF User Manual
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Depth-of-field preview button d)
When a lens with an automatic diaphragm is used, the image in
the viewfinder is viewed with the lens at maximum aperture.
However, by depressing the depth-of-field preview button,
the lens will be stopped down to the aperture set, enabling you
to examine depth of field before shooting. The image in the view
finder darkens according to the selected f-number: the smaller
the aperture (i.e., the larger f-number), the darker the image.
Components of the picture that appear in focus when the button
is depressed will be in the zone of sharp focus.
Note that the button should be depressed all the way.
Note:
When shooting in the automatic exposure mode with an Al lens,
do not release the shutter while depressing the preview button; improper
exposure may result.