6.1.1 AUTO Mode
In the AUTO mode, the brightness and sensitivity of video image can automatically be controlled for each of four sensitivity controls according to the brightness of object.
In case of excess of individual sensitivity control ranges due to too bright or too dark object, the status is automatically switched among four controls as shown in the diagram below to control lens iris and sensitivity.
Lens automatic iris control
Circuit gain (AGC) control
Electronic multiplication (CMG) control
Long term exposure (SS LONG) control
If, for example, a very dark object is shot, the camera tries to control the brightness of the video image by the lens automatic iris control first. However, if sufficient brightness is not obtained even with the lens iris opened, the electronic multiplication (CMG) control is automatically activated to control the sensitivity automatically. If sufficient brightness is not obtained even with the maximum sensitivity of electronic multiplication (CMG) control, the camera keeps the sensitivity of electronic multiplication (CMG) maximum, and automatically activates the circuit gain (AGC) control to control the sensitivity automatically. If a sufficient sensitivity is not yet obtained with the maximum circuit gain control, the camera keeps the sensitivity of each of electronic multiplication (CMG) circuit and circuit gain (AGC) control maximum, and finally activates long term exposure control to control the exposure time of long term exposure automatically.
Electronic multiplication (CMG) control, circuit gain (AGC) control, and long term exposure (SS LONG) control can set maximum sensitivity and maximum exposure time on the screen display menu.
(Refer to the item “7.3.1 When Changing Setting of AUTO SENS Mode”)
6.1.2 MANUAL mode
In MANUAL mode, electronic multiplication (CMG) control, circuit gain (AGC) control, and electronic shutter control are set to their fixed sensitivities on the screen display menu. (Refer to the item “7.3.2 When Changing Settings of MANUAL mode and MANUAL Shutter mode”)
As in the case of AUTO mode, only the lens automatic iris control is automatically controlled.
- 14 -