LPF Site Supporter
- Jul 10, 2015
HPO, my NUBM44 with sanwu 3x expander and 3-element lens does not appear to project a line at any distance. At short distance it is a stubby bar and at long distance it looks like a dot.
Also over time it seems the AR coating on 3 elements can burn into little black balls when using 5W lasers that you can see under magnification, removed from the laser of course. NEVER LOOK INTO A LOADED LASER. When my 3 elements start to get fuzzy if I see those black specks inside I just replace them, it's part of the cost.
Also you cant see the bar at distance without your laser safety glasses on.
At 75feet I see a big spot, but with my glasses on I can zoom the hot center bar to it's tightest.
I cant hold still enough with my camera zoomed in and holding the glasses in front of the camera, I will take a tripod pic later after I feed the cats and myself, but with your glasses on you can adjust to a tight burning bar that you cant see unless you have your amber/orange laser safety glasses on.
I did not hold still, but there is a bar long ways top to bottom but I jiggled it, the cam took a longer exposure on it's own, yea I didn't try to set it right, just set it on normal mode.
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