By far the best proof is experience.  

Sir Francis Bacon (1561 - 1626)

Video-type autoiris

There are two major types of auto-iris lenses: DC-type, and video-type. The video-type auto-iris requires a video signal to determine how far to open the iris on the lens. Some digital camera software controls also include features to control how the autoiris works. (see Autoiris) 

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