Panasonic NV-GS230 Operating Instructions Manual page 32

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Manual iris/gain adjustment
≥If the value does not become "OPEN", you
cannot adjust the gain value.
≥If the gain value is increased, the noise on the
screen increases.
≥Depending on the zoom magnification, there are
iris values that are not displayed.
ª
Shutter speed range
1/50 to 1/8000 seconds: Tape Recording Mode
1/25 to 1/500 seconds:
The shutter speed closer to 1/8000 is faster.
ª Iris/gain value range
CLOSE (Closed), F16, ..., F2.0,
OPEN (Opened) 0dB, ..., 18dB
Value closer to [CLOSE] darken the image.
Value closer to [18dB] brighten the image.
Values with dB are gain values.
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VQT1D15
Record mode
Card Recording Mode