User`s manual

43
The brightness control function adjusts IRIS and AGC gain using an internal
algorithm. The brightness is controlled by gain when the light condition is
dark and by iris when the light condition is bright.
♦ SHUTTER
With this option, the SHUTTER speed takes main control of the exposure, and
both IRIS and AGC will function automatically in cooperation with shutter
speed to achieve consistent exposure output.
♦ GAIN
The auto GAIN control function takes main control of exposure with priority
over SHUTTER and IRIS. The internal circuit will function automatically to
get consistent exposure.
♦ IRIS
With this option, the IRIS function adjust the exposure in higher property.
SHUTTER speed and AGC circuit will function automatically in cooperating
with IRIS to get consistent exposure output. The opening of a lens controls the
amount of light reaching the surface of the selected device. By increasing the
F-stop number (F/1.6, F/2, F/2.4, etc.), less light is permitted to pass.
B-3-6 WBC MODE
A digital camera needs to find reference colour temperature, which is a way of
measuring the quality of a light source, for calculating all the other colours. The
unit for measuring this ratio is in degree Kelvin (K). You can select one of the
White Balance Control modes according to the condition. The following table
shows the colour temperature of some light sources.
Light Sources Color Temperature in K
Cloudy Sky 6,000 to 8,000
Noon Sun and Clear Sky 6,500
Household Lighting 2,500 to 3,000
75-watt Bulb 2,820
Candle Flame 1,200 to 1,500