Hitachi V-21W - Manual (Page 44)

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Optical filter selection
The correct optical filter according to the scene light source needs to be selected in order to obtain correct white
balance. Set the CC/ND filter knob as follows.
No Filter Light source
1 3,200K Studio (tungsten or halogen)
Sunrise, sunset
2 5,600K+1/16ND Outdoors clear sky
3 5,600K Fluorescent lighting
Outdoor cloudy or rainy
4 5,600K+1/64ND Outdoors clear sky