Grass Valley LDK 7500 User Guide - Manual (Page 119)

Set-up and operation HD video mode 5-5
Gain selection
Depending on the available light levels it may be necessary to adjust
the gain of the camera. The gain is selected via the Gain up/down
switch on the left side panel. When this switch is pressed initially,
the current value of the gain in dB is displayed in the viewfinder.
A new value is chosen by scrolling up or down through the five
preset values (-, 0, +, ++ and +++). The actual dB value of these gain
steps can be set in the install menu.
The -, + and ++ indicators at the top of the 2-inch viewfinder show
which preset is selected.
Exposure time
The exposure time values of 1/200, 1/500 and 1/1000 of a second
are used to capture fast moving objects so that these can be played
back sharply in slow motion. The value selected depends on the
speed of the moving object.
Note: Increasing the exposure speed lowers the camera sensitivity
proportionally.
The exposure selection also includes lighting control positions
which can be used when shooting with lighting that is operating at
a different frequency to the camera. There are two position 50 Hz
and 60 Hz. Each of these positions can be varied further in a range
from -10 to +10.
To reduce flicker select the frequency closest to the frequency of
the lights and then vary the lighting control in the system Install
menu to obtain the best result.