Nikon F4 Body Only, F4S instruction manual DEPTH-OF-FIELD Preview Button, Af-L

DEPTH-OF-FIELD PREVIEW BUTTON

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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.

e Depth of field can only be previewed in the Aperture-Priority Auto (A) or Manual (M) exposure modes.

e During preview, autofocus and Electronic Rangefinder opera- tion are not possible.

e During preview with lenses with meter coupler, attaining correct exposure is not possible, because exposure must be determined by full-aperture metering.

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