A new plastic that you can still shoot through. Black to the observer and transparent to video cameras.

Black-Ops Plastics - *** Qwonn Security Products (http://qwonn.com/black-ops-plastics.html)

Andrew

they say :"We can make almost any shape..."
so if you really need it, go ahead, snd them a lens cap sample, shoudn't be a problem to replicate

Transparent lens caps do exist: we call them filters.

But not in color. It indicates its for B&W only.