Thanks guys, feel free to use it as you see fit.
It uses FADE OBJECT to fade the effect out when it's near the edges of the screen, better than just hiding them. In Patch5, I reckon there's a couple of problems, so I suggest changing it so each lens is a tiny amount different on the Z positioning, like .01 or something, because they seem to overlap now and interfere, probably Lees new alpha commands would work better than fade object.
Van-B