ADC 660N and ADC 660P
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When using a DC drive lens, the ALC/ELC DIP #1 must be set to the ALC (OFF)
position.
5. BLC (Backlight Compensation) ON/OFF Switch
If the subject you wish to view is too dim because of a bright background, set the BLC DIP switch #2 to ON to compensate for the bright background.
With BLC on, the background brightness may saturate in some cases. This function may not operate properly if the object is too small compared to the area of the background. This function can be used with either the linear shutter (EE or ELC mode) or an Auto Iris lens (AI lens or ALC mode).
WITH BLC OFF | WITH BLC ON |
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