Grass Valley LDK 7500 User Guide - Manual (Page 120)

5-6 HD video mode Viper
Internal optical filter
Neutral density filters can be placed in the path of the optical signal
to restrict the incoming light. The filter is selected via the filter
switch at the top-front of the camera. These filters can be used, for
example, to control depth of field. A second filter wheel in the
camera contains special-effect filters.
The camera does not need colour optical filters to be able to white
balance correctly. The range of the auto-white balance is so wide
(from 2.5K to 20K) that there is never any need to use colour filters
to obtain the correct white.
Colour temperature selection
For true colour reproduction the ambient lighting conditions must
be compensated for by selecting a value for the colour temperature.
The standard file setting is 3200K (normally used for tungsten light).
Two other reference colour temperatures are available; 5600K (for
outdoors, clouded conditions) and 7500K (for outdoors, clear blue
skies).
Three similar memory positions (FL, AW1 and AW2) are available
to store the results of the auto-white measurement process. The FL
position is recommended for shooting with fluorescent light.
A continuous automatic white balance position (AWC) is also
available. This function continuously measures the white balance
and adjusts accordingly. It can be used when a constant colour
balance is required under changing lighting temperatures (sunsets,
indoors/outdoors use). When AWC is selected none of the colour
temperature indicators in the 2-inch viewfinder light.