Hitachi V-21W - Manual (Page 49)

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White and black balance adjustment
Black balance adjustment
Black balance requires adjustment in the following situations.
Equipment being used for the first time
Equipment idle for an extended period
Large change of ambient temperature
Gamma setting changed
Auto black balance adjustment
1. Set the switches as indicated in the figure.
2. Set the Auto W/B BAL switch to ABB and release the switch.
The switch returns to center for adjustment.
3. The viewfinder displays the following messages during adjustment.
The lens iris is automatically closed.
4. Adjustment is completed in several seconds and automatically stored in memory.
Adjustment in progress Adjustment completed
Displays the FILTER
position and the color
temperature of the lighting.