Hitachi SICOLOR DIG K550, Operation Manual

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2)
Position the cursor at SET and press the left (right) direction button to change CLOSE to
OPEN in order to save the setting.
3)
Position the cursor to LIGHT CONTROL and press the Set button to display the LIGHT
CONTROL MENU.
Light control menu
Three control modes are available in combination with the AGC operation.
The LENS mode is established at factory. To change the LENS mode to other mode,
move the cursor to the desired control mode by the left or right button, and press the set
button.
To use the LENS mode, move the cursor to LENS, and press the set button.
À
LENS mode:
In this mode, quantity of light can be controlled only by the lens iris.
Á
AES mode:
In this mode, quantity of light can be controlled only by the automatic electronic shutter of
the CCD imaging device.
An optimum video signal level is maintained for a fixed iris lens.
When an auto iris lens is used, the lens iris is automatically opened to a maximum, and
only the automatic electronic shutter operates.
A shutter speed is selectable from the standard (1/50s) to 1/10,000s.
Therefore, the automatic electronic shutter operates under the illumination condition
within the range of 160 times, compared with the quantity of light, and this mode may not
be effective in the outdoors where illumination changes largely. In such cases, change to
other mode.
When the lens iris is opened to a maximum in this mode, the depth of focus may become
shorter than the auto iris lens used in other mode, and objects in the distance are out of
focus. The depth of focus is in inverse proportion to the opening of a lens iris.
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