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ISO film speed
The international standard for representing fi
lm
sensitivity. The higher the number,
the greater the sensitivity, and vice versa. A film speed
of
ISO 200 is twice
as
sensitive
as
ISO 100, and half that
of
ISO 400 film.
Rear-Curtain Sync
Flash fires
an
instant before the second (rear) curtain
of
the focal plane shutter
begins to move. When slow shutter speeds
are
used, this feature can create a blur
effect from the ambient light, i.e., flowing-light patterns following a moving subject
with subject movement frozen at the end of the light flow.
(See
"Front-Curtain
Sync".)
Slow
Sync
A flash technique for using the flash at a slow shutter speed. Flash shooting
in
dim
light or at night at a fast shutter speed often results
in
a flash-illuminated subject
against a dark background. Using a slower shutter speed with the flash brings out
the background details
in
the picture. Use
of
a slow shutter speed with Rear-
Curtain Sync is particularly effective for illustrati
ng
the movement of a stream of
light.
The N65/N65QD's Slow Sync mode extends the automatically controlled shutter
speed range down to 30 sec.
(in
Auto-Multi Program, Aperture-Priority Auto) or 1
sec.
(in
~
Night Scene mode).
Vignetting
Progressively diminished illumination on the film from the center to the corners.
There are
two
kinds
of
vignetting-natural
vignetting caused by the lens, and
vignetting that is caused by improper use
of
accessories such
as
a lens hood or
filter.
105
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