I recently got a 405nm laser 301 (I know they aren't very good, but i just wanted something cheap to start on). I have always been interested in lasers, I just never got anything other than a cheap 5mw red pet laser. I eventually plan on building a lower power (less than 500mw) 520nm or a 1.6ish...
I recently got a 405nm laser 301 and I was wondering if I could tighten the focus knob, as when I focus it, it almost immediately comes slightly out of focus unless I keep it very still.