Nikon R10 Super Zoom Buku Petunjuk - Halaman 18

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Halaman Cetak

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)

1/40.Ssec.

1/81 sec.

1/162 sec.

1/54 sec.

1/108 sec.

1/216 sec.

1/121 sec.

1/243 sec.

1/486 sec.

18-EXPOSURE CONTROLS