Depth-of-field preview button – Nikon F4 User Manual

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DEPTH-OF-FIELD PREVIEW BUTTON

When a lens with an automatic diaphragm is used, the view
finder image is viewed with the lens at maximum aperture. By

depressing the depth-of-field preview button, you stop the lens
down to the aperture set, enabling you to examine depth of

field before shooting. The viewfinder image normally darkens

as the aperture gets smaller. Portions of the picture that appear

in focus when the button is pressed are in the zone of sharpest

focus.

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