Shooting The Screen Image On A Computer Monitor; Gain (Sensitivity) Adjustment; Gain Switching; Gain Boost Under Lolux Condition - JVC GY-DV500E - Pal Professional Dv Camcorder Instructions Manual

13. FEATURES OF THE CAMERA SECTION

13-3 Shooting the Screen Image on a Computer Monitor

Band
Video monitor
OPERATE/WARNING
LIGHT
RESET ON
OFF
MONITOR
COUNTER
FILTER SELECT
CTL
1 3200k ALARM TC
2 5600k UB
3 5600k+ND
SHUTTER STATUS MONITOR
MENU
CH-1 AUDIO CH-2
LEVEL
AUTO IRIS FULL AUTO BLACK LOLUX
BACK L STRETCH
NORMAL NORMAL
SPOT L COMPRESS
NG POWER
ON OFF
SHUTTER dial
- - - OPERAT I ON - - -
SCENE F I L E A
SHUT TER : VAR I ABL E
: NONE
FAW
GA I N L : 0 dB
GA I N M : 9 d B
GA I N H : 1 8 d B
SMOOTH TRANS : OFF
PAGE BACK
OPERATION MENU screen
Outline
The following operation allows the alignment of the shutter
speed of the camera with the variable scanning rate of a
computer monitor or display.
When a computer monitor screen or display is shot with the
camera, a bright horizontal line indicating excessive exposure
is displayed in cases when the scanning rate of the monitor
is faster than the shutter speed of the camera. A dark
horizontal line indicating insufficient exposure is displayed in
cases when the monitor's scanning rate is slower than the
camera's shutter speed.
The scanning frequency of a monitor varies due to various
reasons during the computer operation. Adjust the scanning
rate to obtain a stable image while observing the image in
the viewfinder.
Variable Scan [V.SCAN]
• Basic operation
Set the SHUTTER item on the OPERATION MENU screen
to VARIABLE. Then move the SHUTTER knob upwards or
downwards to change the shutter speed.
(The speed is displayed on the viewfinder screen.)
• Compatible frequencies
The variable scan function is compatible with scanning
frequencies in the following range.
60.1 to 2084.6 Hz (U-ver.)
50.1 to 2067.8 Hz (E-ver.)
CAUTION:
This function is not compatible with slow-speed computer
monitors with a vertical scanning speed of 60 Hz (U-ver.)/
50 Hz (E-ver.).
13. FEATURES OF THE CAMERA SECTION

13-4 Gain (Sensitivity) Adjustment

The gain should be switched when the brightness is insufficient due to poor lighting conditions.

GAIN SWITCHING

GAIN switch
AUTO IRIS FULL AUTO BLACK
BACK L
NORMAL
SPOT L
NG
ON
CAUTION:
When gain is set to "ALC", gain is boosted automatically
as the illumination becomes darker. However, noise will
increase a little because the screen becomes brighter as
the ALC (Auto Level Control) function boosts the gain more
than in the case of manual adjustment.

GAIN BOOST UNDER LOLUX CONDITION

AUTO IRIS FULL AUTO BLACK
BACK L
NORMAL
SPOT L
NG
[Relationship between gain, iris and shutter]
0.7 Lx 8 Lx
33 dB 12dB
LOLUX ALC
81 82
This switch allows the gain to be boosted when the illumination
of the subject is insufficient.
Switch Position
L
LOLUX
STRETCH
NORMAL M
COMPRESS
H
When the GAIN switch is switched, the newly set gain is
displayed for about 2 seconds on the Status 0 or Status 1 screen
POWER
in the viewfinder.
OFF
Set it to L (0 dB) in normal use.
The gain set for each of the switch positions can be changed
with "GAIN" on the OPERATION MENU screen.
It is also possible to use the ALC function that varies the gain
automatically.
See page 73 for details.
To make the gain transition smoother, set "SMOOTH TRANS"
on the OPERATION MENU to "ON".
See page 73.
However, note that the SMOOTH TRANS function is not
available if gain is set to ALC.
LOLUX on/off button
The LOLUX button is used when the illumination is still
insufficient after compensating with the GAIN switch.
LOLUX
Press the button to enter the LOLUX mode in which the gain is
STRETCH
NORMAL boosted by about 33 dB.
COMPRESS
"LOLUX ON" is displayed for about 2 seconds on the Status 0
or Status 1 mode screen in the viewfinder.
Pressing the button again cancels the LOLUX mode.
"LOLUX OFF" is displayed for about 2 seconds.
POWER
When the LOLUX function is in use, the image definition on
ON OFF
the screen will degrade to increase residual images, but this
is not a malfunction.
32 Lx 2000 Lx 4200 Lx
FULL AUTO SHOOTING
0 dB
AUTOMATIC IRIS
F1.4 F11
Factory-Set Gain
0dB
9dB
18dB
18000 Lx
1/60 (U-ver.) 1/240 (U-ver.)
1/50 (E-ver.) 1/200 (E-ver.)
EEI
F16