The lens diameter in the system I have is only 0.020"
Peteski
Wow, that is only 3-1/4 scale inches. I have some real camera glass with bigger lenses than that.
The interesting thing about making the lens and "film" tiny is that it tends to give a much more realistic perspective to the images produced, both in the apparent lengths of subjects and in depth-of-field that is in-focus. The ability to make tiny, but densely pixilated sensors has made that possible.
Now, if Petski can just make a Wifi camera that is a "drop-in" replacement for the headlight on my N scale E series passsenger engines ....