Quote -   Dirty little secret: Lux's perspective camera does not have any physical volume. It's like a weird singularity-pinhole-camera. :P It exists only at the camera object's center point.

Modeling a surface for the lens is actually a really good idea I never though of. A small box of architectural glass ought to do the job nicely.

 

But wouldn't that give unwanted reflections of the scene behind the camera on the glass in front of the 'camera'?

Maybe a cilinder primitive with a solid plane on one end, and glass on the other would be safer. I'll try and see if I can parent one to a camera, to make it pan and tilt with it.

Cheers!