Nikon N90 AF Instruction Manual page 76

HYPERFOCALPROGRAM
Ie'S fS.6
BJDD
HF
Although this program does not actually set the hyperfocal
distance, it emulates the effects achieved by using very small
lens apertures and short focal length lenses. The result will be a
very large depth of field which yields a wide range of
acceptable sharpness surrounding the focused plane of
maximum sharpness. Use this program when photographing
landscapes and other subjects that encompass great depth.
The effect becomes more pronounced if there is an interesting
foreground within the scene.
76