405-G-2 M9X9MM Laser Lens Glass Collimating Lens Holder Coated for 405nm, 445nm, 515nm - 4mm Focus, 1pcs

I bought a new lense to replace the scratched lense that came with my 5w blue/violet laser. The lense I received from this seller was far superior, it increased the performance of my laser. laser now works even better than I had expected.

They don't put out any beam all it does is make the laser dissipate right away they suck

Was as advertised good quality and fitment

I bought this lens as a replacement for my 450 NM laser pointer. I could never get a beam to a perfect point. This might go to a different kind of laser as far as the Thor type model it will stay with a rectangular point. It functioned that's why I gave it three stars but as a warning look up the exact type of lens in your laser pointer

focused my 2w 445nm laser down to a small line, capable of burning things.

They worked really well but can’t be t rough n them

I have some experience with changing lenses in lasers, so this was no surprise. This lens does in fact allow around 98% of the optical power of your laser to come through the diode, but it doesn’t really give the “traditional” beam shape. When installed correctly it provides only the round shape of an unfocused laser, when installed backwards it give the “bow tie” shape. This is the only way to actually focus the beam to a workable dot.Overall, if you don’t care about the aesthetics of a proper beam and dot, please buy this. But if you want a proper laser lens, buy from elsewhere