Grass Valley LDK 500 - Manual (Page 54)

Operating instructions | Video preferences 4-15
When the colour bar is selected the following functions are temporarily set to Off:
• Black stretch
• White limiter
• Zebra
• Safe area (VF)
• Cadre (VF)
The lens iris closes automatically when the colour bars are switched on.
4.8.3 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 up/down scroll Gain switch (10) on the left-front
side of the camera. When this switch is pressed initially, the current value of the gain in
dB is displayed in the viewfinder.
The up/down scroll Gain switch (10) gives a choice of five master gain settings: -, 0, +,
++ and +++. The actual value of the gain in dB is assigned to these symbols in the
INSTALL menu.
The Gain indicators (28) in the viewfinder light to indicate the value selected. (The +
and ++ indicators light when the gain is +++.)
4.8.4 Optical filter selection
A neutral density filter and a special effect filter can be placed in the path of the optical
signal to modify the incoming light. The filters are selected via the Filter switches (1)
at the top-front of the camera. These filters can be used, for example, to control depth
of field or exposure levels.
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. Rotate the switches to move
the optical filter wheels.
Table 4-2. Gain values
Symbol Gain
- can be set to: -6dB or -3dB
0 is always 0dB.
+ can be set to: 6, 9, 12 or 18dB
++ can be set to: 9, 12, 18 or 24dB
+++ can be set to: 30 or 36dB (or 42dB IT/ITW)