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ISO film speed
The
international
standard
for
representing
film
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
I
SO
400
film
.
Metering system
See
the
column
on
page
32
.
Rear-Curtain Sync
Flash
fires
an
instant
before
the
second
(rear)
curtain
of
the
focal
plane
shutte
r
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
fo
llo
wing
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
.
The
N751N75QD
's
Slow
Sync
mode
extends
the
automatically
controlled
sh
utt
er
speed
range
down
to
30
sec
.
(in
Auto
-
Multi
Program
,
Aperture
-
Priority
Auto)
or
1
sec
.
(in
t:::I
Night
Portrait
mode)
.
Vignetting
Progressively
diminished
illumination
on
the
film
from
the
center
to
the
corners.
Th
ere
are
two
kinds
of
vignetting-natural
vignetting
caused
by
the
lens
,
and
vignetting
that
is
caused
by
improper
use
of
accessories
such
as
a
len
s
hood
or
filter
.
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