A: A Video Auto Iris lens has a little amplifier built in which responds to the amount of ambient light and will open or close the iris automatically to maintain the same amount of light coming into the CCD imager. This allows the picture to not become too bright or too dark.
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A: A Video Auto Iris lens has a little amplifier built in which responds to the amount of ambient light and will open or close the iris automatically to maintain the same amount of light coming into the CCD imager. This allows the picture to not become too bright or too dark. 
