JVC DZ-VCA1SE At-a-glance, 1 SHUTTER switch, Flicker-freemode, SHUTTER switch 1 and, Shutter control section, sensitivity range chart, 2 SHUTTER UP/DOWN buttons

Shutter control section

1 SHUTTER switch	2 SHUTTER UP/DOWN buttons
SHUTTER	SHUTTER
OFF	OFF
ON V.SCAN	ON V.SCAN

SHUTTER switch 1 andSHUTTER [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.

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.

At-a-glance sensitivity range chart (relationship between gain, iris value and shutter)

62.5

125

250

500

1000

2000

4000

8000

16000

32000

64000

128000

256000

ALC (1/60s)

+12dB +6dB 0dB –4dB

1/60s 1/60s 1/60s 1/60s

ALC + EEI (1/60s)

0dB

1/2000s

+12dB

+6dB

0dB

1/60s

1/120s

1/240s

1/480s

1/960s

1/1920s

ALC + EEI (1/30s)

0dB

1/2000s

+6dB

0dB

1/30s

1/60s

1/120s

1/240s

1/480s

1/960s

1/1920s

ALC (1/60s)

+12dB

+6dB

0dB

–4dB

1/60s

ALC + EEI (1/60s)

0dB

1/2000s

+12dB

+6dB

0dB

1/60s

1/120s

1/240s

1/480s

1/960s

1/1920s

ALC + EEI (1/30s)

0dB

1/2000s

+6dB

0dB

1/30s

1/60s

1/120s

1/240s

1/480s

1/960s

1/1920s

F1.4

F2.8

F5.6

F11