Amusing Accidental Test of Autofocus & Light Sensitivity

I forgot to remove the lens cap from this older Sony Handycam--and I found myself wondering what was this rather strange image that it recorded:



Eventually, I figured out that even with the small amount of sunlight getting in through the edges of the cap--and at a distance of a few millimeters--the camera was successfully adjusting its sensitivity and focus to capture the inside of the lens cap.