8 Nov
2011
8 Nov
'11
2:19 p.m.
Anyone remember the impromptu tests we did at SPOC a few years ago? Most of the cheapies weren't even visible unless you were dead-on-axis, standing right next to the laser. Not much good in a crowd. In very transparent air with little water vapor or suspended dust, you couldn't see a thing. The 20mW units fared much better.