Hitachi V-21W - Manual (Page 45)

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Video gain selection
The gain can be raised to enable images in locations
with inadequate lighting. Notice that noise increases
as the gain is raised.
1. The viewfinder image darkens when lighting is
insufficient. If the lens is auto iris, the iris opens
completely. The iris setting can be checked
from the viewfinder screen.
2. When the gain switch is set to M or H, an
exclamation point (!) appears in the viewfinder to
advise of high gain mode.
3. Gain values at L, M and H switch positions are set at the Function 1 page.
GAIN switch Gain value
L(LOW) -3dB 0dB
M(MID) 6dB, 9dB , 12dB
H(HIGH) 12dB, 18dB , 24dB
4. ULTRA GAIN
When the gain setting is above +12 dB, set the Ultra Gain switch to on to increase the sensitivity about 12 dB
further. Notice this reduces the horizontal resolution by about half. Normally set the switch to off.
L: standard (normal) gain (0, -3dB)
M: (6, 9, 12dB)
H: (12, 18, 24dB)