It's too time consuming to post actual videos here, but I hope the pictures help a little.
The image on the left has a black panty hose over the front of the lens (and a UV filter and IR filter). The image on the right is just what the camera picks up (with our custom settings).
Lens test - comparing shutter speed. The difference in image quality is affected by simply changing the amount of light that enters the camera (shutter speed) by a fraction of a second.