Digital Camera User Manual
Exposure control
Programmed auto: Camera sets both shutter speed and
aperture for correct exposure.
Shutter-Priority auto: User selects shutter speed and camera
sets matching lens aperture for correct exposure.
Aperture-Priority auto: User selects aperture and camera sets
matching shutter speed for correct exposure.
Manual: User selects both shutter speed and aperture,
following or ignoring the meter's recommendations (by LCD
readout)
to
achieve the desired exposure.
Fill
-flash
A method
of
flash photography which combines flash
illumination and ambient light, but does not necessarily attempt
to
balance these
two
types of illumination.
Focus-Priority for autofocus
Shutter cannot be released until subject is
in
focus. Suitable
when in-focus subject
is
important.
With N90 camera body, Focus-Priority
is
given
to
Single Servo
AF
mode while Release-Priority is given
to
Continuous Servo
AF.
However, the Electronic Organizer can change priority
to
perform Release-Priority Single Servo
AF
or Focus-Priority
Continuous Servo AF.
140
Flash synchronization
The timing
of
the flash so it fires coincident with the operation
of
the camera's shutter. There are
two
types
of
synchronization:
Normal Sync which fires the flash at the start
of
the exposure,
and Rear Sync which fires the flash at the end
of
the exposure.
f-number
The numbers on the lens aperture ring and on the N90
's
LCD
which indicate the relative size
of
the lens aperture opening.
The f-number series is a geometric progression based on
changes
in
the size
of
the lens aperture, as it
is
opened and
closed. As the scale rises, each number is multiplied by the
factor 1.4. The standard numbers for calibration are 1.0, 1.4, 2,
2.8,4,5.6,8,
11,16,22,32,
etc., and each change results
in
a
doubling or halving of the amount
of
light transmitted by the
lens.
Hyperfocal distance
The closest point a photographer can focus on where the
depth of field includes infinity. When the lens is focused for
hyperfocal distance, the deepest depth of field, covering from
1/2 the hyperfocal distance to infinity, can be obtained at each
f/stop. The longer the focal length, the longer the hyperfocal
distance; the smaller the aperture (the larger the f/number), the
shorter the hyperfocal distance.