36 Pelco Manual C1456M-D (10/98)5.11.2 Backlight Compensation
There are two backlight compensation modes: on and off.
Backlight compensation allows the Spectra® (Version 3.0) dome to compensate for
bright light behind the object you want to view. With backlight compensation On, the
Spectra® (Version 3.0) dome will use only the center 10 percent of the picture for
adjusting the iris (refer to Figure 15). If there is a bright light source outside of this
area, it will wash out to white. The camera will adjust the iris so that the object in the
sensitive area is properly exposed.
To change the backlight compensation mode:
1. Program Preset 95 (28 if in 32-preset mode; refer to Section 5.4, PRESET
FUNCTIONS) to access the main menu (refer to Section 5.11.1, MAIN MENU
ACCESS). The main menu will appear.
2. If the cursor (>) is not beside Camera, move the joystick up or down to position
the cursor beside Camera.
3. Press the Iris Open button to enter the Camera submenu.
4. Move the joystick up or down to position the cursor beside Backlight Comp.
5. Press the Iris Open button on your keyboard. A star will appear beside Back-
light Comp and the cursor will move to the right beside the word On or Off.
6. Move the joystick up or down to toggle between On and Off.
7. SELECT - Press the Iris Open button on your keyboard to select your choice.
CANCEL - Press the Iris Close button if you do not want to change the setting.
5.11.3 Zoom Limit
The Spectra® (Version 3.0) dome can magnify an object up to 96 times. The dome
has 12X optical zoom and 8X of electronic (digital) zoom for a total of 96X zoom.
The amount of zoom can be set for 12X, 24X, 48X, or 96X.
To change the zoom limit:
1. Program preset 95 (28 if in 32-preset mode; refer to Section 5.4, PRESET
FUNCTIONS) to access the main menu (refer to Section 5.11.1, MAIN MENU
ACCESS). The main menu will appear.
2. If the cursor (>) is not beside Camera, move the joystick up or down to position
the cursor beside Camera.
3. Press the Iris Open button to enter the Camera submenu.
4. Move the joystick up or down to position the cursor beside Zoom Limit.
5. Press the Iris Open button. A star will appear beside Zoom Limit and the cur-
sor will move to the right beside the current zoom limit.
6. Move the joystick up or down to choose the zoom limit.
7. SELECT - Press the Iris Open button on your keyboard to select your choice.
CANCEL - Press the Iris Close button if you do not want to change the setting.

Figure 15. Backlight Compensation

Non-Sensitive Area

Sensitive

Area