Need to replace my dirty, burnt, scratched and cracked 2" lenses I've been using in the Triumph. For fun I bought a couple of GaAs lenses.

Pretty cool to look at, no visible light penetrates. I know a red laser pointer won't penetrate either, but I'm not worried about that so much. I'm just curious how they'll work, if I'll see any difference, bad or good?

Funny thing is, as bad as my old lenses are, they all seem to work okay when engraving. But I'm thinking I might be losing some cutting power, or maybe more accurately, cutting DEPTH.

Anyway, before I try out a lens that looks like a mirror, thought I'd be sure it's NOT