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C2491M-D (8/06) 15
SWITCH SETTINGS FOR FIXED FOCAL LENGTH LENS WITH
AUTO IRIS
Refer to Figure 15. The switch is located next to the lens. Automatic backlight compensation (factory
setting) is used under varying lighting conditions (such as outdoors) or fixed lighting conditions where
there are no bright spots that darken other picture details. Manual backlight compensation is used in
fixed lighting conditions to optimize the picture detail when there are bright spots.
Figure 15. Switch Settings for Fixed Lens with Auto Iris
SWITCH SETTINGS FOR FIXED FOCAL LENGTH LENS WITHOUT
AUTO IRIS
Refer to Figure 16. The switch is located next to the lens. Automatic backlight compensation (factory
setting) is used under varying lighting conditions (such as outdoors) or fixed lighting conditions where
there are no bright spots that darken other picture details. Manual backlight compensation is used in
fixed lighting conditions to optimize the picture detail when there are bright spots.
Figure 16. Switch Settings for Fixed Lens Without Auto Iris
FACTORY SETTINGS
ON
OFF
= SWITCH POSITION
ALC
Y
BLC
ABL
ELC
DC
OFF
OFF
ALC/ELC switch: Always ALC
Y/DC switch: Always DC
Auto backlight compensation: BLC switch OFF
ABL switch ON
Manual backlight compensation: BLC switch ON
ABL switch OFF
NOT USED
FACTORY SETTINGS
ON
OFF
= SWITCH POSITION
ALC
Y
BLC
ABL
ELC
DC
OFF
OFF
ALC/ELC switch: Always ELC
Y/DC switch: Not used
Auto backlight compensation: BLC switch OFF
ABL switch ON
Manual backlight compensation: BLC switch ON
ABL switch OFF