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About
Focus
and
Ex
osure
Focus, exposure and metering system are important factors for taking pictures.
Knowing the characteristics of each factor helps you widen your photographic
expression.
30
Focus and depth of field
When focusing, depth of field should be considered. Depth of field
is
the zone of
sharpest focus
in
front of and behind the subject
on
which the lens
is
focused. It
varies according to shooting distance, focal length and, above all, aperture.
Smaller apertures (larger f-numbers) will produce a deeper depth of field where
the background and foreground become sharper; larger apertures (smaller f-
numbers) will produce a shallower depth of field where the background becomes
blurred.
Exposure
Light from the subject passes through the lens and
is
sensed by the film. Light
reaching the film
is
controlled by the shutter speed and aperture. The proper
combination of shutter speed and aperture for subject brightness and film
sensitivity results
in
the correct exposure.
The N60/N60QD's General-Purpose Program, Auto-Multi Program and
Vari
-
Program automatically control shutter speed and aperture.
In
Shutter-Priority
Auto exposure mode, you can manually set shutter speed and the camera
automatically sets the proper aperture.
In
Aperture-Priority Auto exposure mode,
you can manually set aperture and the camera automatically sets the proper
shutter speed.
In
Manual exposure mode, you manually set both shutter speed
and aperture.
Metering System
As the proper combination of shutter speed and aperture for correct exposure
is
determined according to subject brightness and film sensitivity, measuring
subject brightness
is
very important.
In
general, brightness inside the viewfinder
is
not uniform. The N60/N60QD
provides two metering systems: Matrix Metering and Center-Weighted Metering.
With Matrix Metering, data on scene brightness
is
detected by the six-segment
Matrix sensor. With Center-Weighted Metering, most of the meter's sensitivity
is
concentrated
on
the 12mm-diameter center circle
in
the viewfinder.
(With D-type
AF
Nikkor lens
es,
the N60/N60QD camera performs
3D
Matrix
Metering. See page 48.)