4
5
aGC – automatic Gain Control
The AGC function provides a clear image in low light condition. This controls
an amplifier that is used to boost the video signal when the light dims so as to
increase the camera’s sensitivity.
Normally AGC will be turned OFF for Lunar, Planetary, Solar (with full-aperture
solar filter) and Terrestrial imaging and turned ON for low light deep space
objects.
FlC – Flickerless mode
Flickerless mode is used for suppressing the flicker of light (illuminating the cap-
tured scene) produced depending upon the frequency of the power source. In
50Hz area, the CCD exposure time is 1/50sec and if NTSC camera is used with
working frequency of 60Hz, there will be flicker on the screen. Same will happen
in using PAL camera in a 60Hz area.
The shutter speed is fixed to 1/100 sec for the 50 Hz area and 1/120 sec for the
60 Hz area to reduce the flicker of the fluorescent light.
Note: FLC is not normally used for astronomy.
BlC – Background light Compensation
Background Light Compensation is used when there is a very bright background
with very dim front image.
Note: BACK LIGHT is not normally used for astronomy.
Color
White Balance
CCD security cameras feature this adjustment to compensate for ambient light
color. Since there’s a color difference between standard light bulb light and sun-
light, white balance adjusts to ensure a more realistic picture.
There are two white balance control modes, namely Auto tracking white balance
(
ATW) and Auto White Balance (AWB).
AWB – Auto White Balance
AWB is a preset type function whereby white color in the scene is detected
andwhite balance is automatically adjusted, then the setting status is stored. It
automatically memorizes the adjusted white balance value every time the AWB
Every time that particular button icon is now pressed, the Luminance and Color
settings will change to the saved values.
The DSVCII App stores this information for future use.
Pressing the default button will return all presets to their default settings.
luminance
ALC/AES
Choose between ALC (Auto Luminance Control) or AES (Auto Electronic
Shutter)
ALC
Automatic Luminance Control (ALC) indicates the image sensor’s ability to auto-
matically adjust in diverse lighting conditions to yield the most vivid video image
possible.
Move the slider bar to change shutter speeds from OFF to 1/10000 of a second.
AES
AES is used when a manual or fixed iris lens is fitted and the shutter speed will
respond to the amount of light to keep the signal output at optimum level. AES
allows changing the iris level automatically without using the auto iris lens.
Slow Shutter
When Slow Shutter switch is on the slider defines the integration time of expo-
sure up to a maximum of 4 seconds (NTSC camera) and 5 seconds (PAL
Camera).
For low light deep space objects SHUTTER should be turned OFF.
Priority
Choose between AGC or Slow Shutter
Set to AGC for low light deep space objects.
Figure 4.
Luminance.
Figure 5.
Color.
