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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.
The N55'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
Portrait 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.
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