Nikon R10 Super Zoom Manuale di istruzioni - Pagina 18
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Shooting with the Variable Shut¬
ter Opening
The actual amount of exposure de¬
pends on the angle of the shutter
opening and on the speed at which
the shutter blade travels across the
film. If the speed of travel remains
constant, different exposure times
are obtained solely by variations in
the angle of the opening. This camera
has a variable shutter which can
cover a range of movement from
fully open (160°) to totally closed
(0°). When the shutter is opened at
80°, the effective exposure time per
frame is thus only half of what it is
with the 160° opening. The closing
rate of the shutter opening can be
checked in the viewfinder through
the movement of the red indicator.
The table below shows the exposure
times at each of three different
angles of the shutter opening at three
running speeds.
Since the shutter opening can be
varied
from
fully
open to fully
closed, the variable shutter provides
another means of exposure control.
It also permits fading during filming.
Its practical use is for cutting the
exposure
time.
Reduced exposure
time gives the same effect as in¬
creased
shutter
speeds and
thus,
small shutter openings are used to
arrest fast movement. To close the
shutter opening, depress the shutter
blade opening control and turn it-
counterclockwise until the edge of
the red indicator visible in the view-
©
Shutter blade opening angle
(Full-opening) 160® '
(1/2) 80°
(1/4) 40°
Running speed (fps)
18
1/40.Ssec.
1/81 sec.
1/162 sec.
24
1/54 sec.
1/108 sec.
1/216 sec.
54
1/121 sec.
1/243 sec.
1/486 sec.
18-EXPOSURE CONTROLS