Nikon N4004s - Manual (Page 49)

Balanced Fill-Flash Photography with
Multi-Sensor Metering System
Other automatic fill-flash systems do not consider background
lighting. Although they often result in well exposed subjects, the
background may be terribly washed out or dark.
The N4004S Decision Master System uses special multi-sensor
light metering to evaluate such conditions and perform “Balanced
Fill-Flash." This means it controls the flash exposure so the
main subject is well exposed, and at the same time controls the
background exposure. With this system, both the main subject
and the background are correctly exposed, producing a much
more pleasing picture.
To avail yourself of this feature and brighten a subject which
might otherwise come out dark due to available light conditions,
simply use the Decision Master System’s automatic balanced
fill-flash capability. This system produces balanced fill-flash
when shooting within the flash’s normal operating range.
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