To my understanding it is a variable image diffusing device:
A rotating diffuser obscures the image path repeatedly. One can chose to fire a flashlight either with the image beams on-obscured or obscured.
-) The ratio between both makes the degree of diffusion in case of a simple setup.
-) If one uses several lights selectively aimed on different parts of the subject, the images of these parts can get different degrees of diffusion.
I asume the latter to be the actual point behind that device.
(I see this device for the very first time, but this is what I make of it.)
Last edited by AgX; 08-07-2013 at 01:46 PM. Click to view previous post history.