Shutter Control Section - JVC DZ-VCA1SE Instructions Manual

Shutter control section

1 SHUTTER switch
SHUTTER switch 1 and
SHUTTER [UP]/[DOWN] buttons 2
When the SHUTTER switch 1 is set to [ON]
• Press the SHUTTER [UP] button 2 to decrease the
shutter speed.
• Press the SHUTTER [DOWN] button 2 to increase
the shutter speed.
Shutter speeds from 1/2000 to 1/30 sec. are avail-
able.
Usually shutter speed is not stored. If you want to
store it, set the shutter speed and then, switch a
cycle of change from [ON] to [OFF] of the 1 MENU
switch on page 16 in spite of the initial position.
When the SHUTTER switch 1 is set to [OFF]
The shutter speed is fixed at 1/60 sec.
When the SHUTTER switch 1 is set to [V. SCAN]
Set the shutter speed to match the scanning speed of
a computer monitor. When shooting a monitor, fine-
adjust the shutter speed to eliminate bright and dark
bars running horizontally. When the shutter speed is
faster than 1/60 sec., it is possible to fine adjust it with
the SHUTTER [UP]/[DOWN] buttons 2.
When the SHUTTER switch 1 is set to [OFF] or
the gain control section is set to [ALC+EEI], the
SHUTTER [UP]/[DOWN] buttons 2 have no effect.
At-a-glance sensitivity range chart (relationship between gain, iris value and shutter)
8 16
ALC (1/60s)
ALC + EEI (1/60s)
ALC + EEI (1/30s)
SHUTTER
OFF
ON V.SCAN
32 62.5 125 250 500
+12dB +6dB 0dB –4dB
1/60s 1/60s 1/60s 1/60s
+12dB +6dB 0dB 0dB 0dB
1/60s 1/60s 1/60s 1/120s 1/240s
+6dB 0dB 0dB 0dB 0dB
1/30s 1/30s 1/60s 1/120s 1/240s
ALC (1/60s)
ALC + EEI (1/60s)
ALC + EEI (1/30s)
F1.4 F2 F2.8
2 SHUTTER UP/DOWN buttons
Flicker-free mode
Prevents flickering caused by fluorescent lighting in a
50-Hz area.
When the shutter speed is set to 1/100 sec. (Flicker-free
mode), flickering is eliminated.
• When looking at the picture on the monitor during
the use of the electronic shutter, the movement of
the subject may appear discontinuous. This
phenomenon occurs because the picture for
1/2000 sec. is taken out every 1/60 sec.
(e.g.: Shutter speed of 1/2000 sec.)
• When the shutter speed is set to 1/2000 sec., the
charge storage time of the CCD image sensing
device is reduced to approx. 1/32. As a result, the
sensitivity is 1/32 that for the ordinary normal mode
(1/60 sec.) and the light is insufficient.
When shooting, increase the illumination by a
factor of 32 or open the lens iris by 5 if sufficient
light is available to obtain the optimum exposure.
• As the shutter speed in the V. SCAN mode is not
displayed, set the speed by viewing the picture so
that a stable picture can be obtained.
1000 2000 4000 8000 16000
0dB
1/2000s
0dB 0dB 0dB
1/480s 1/960s 1/1920s
0dB
1/2000s
0dB 0dB 0dB
1/480s 1/960s 1/1920s
+12dB +6dB 0dB –4dB
1/60s 1/60s 1/60s 1/60s
+12dB +6dB 0dB 0dB
1/60s 1/60s 1/60s 1/120s
+6dB 0dB 0dB 0dB
1/30s 1/30s 1/60s 1/120s
F4 F5.6 F8 F11
SHUTTER
OFF
ON V.SCAN
32000 64000 128000 256000
0dB
1/2000s
0dB 0dB 0dB 0dB
1/240s 1/480s 1/960s 1/1920s
0dB
1/2000s
0dB 0dB 0dB 0dB
1/240s 1/480s 1/960s 1/1920s
15