CNCOLETECH CO2 Laser Lens Dia:15mm FL:2 or 50.8mm Laser Mirror CVD ZnSe Focus Focal Lens for CO2 Laser Engraving Cutting Engraver/Cutter 40W-200W

Great for big laser machine

Would definitely buy again!

Replaced original lens in 40w laser cutter and was able to use less power to cut through wood.

smaller than others I have ordered but still worked

Ottimo acquisto

Yeah this is not 12mm and therefore unusable junk.

works great

smaller than others I have ordered but still worked

I bought a 2.0 focal length CVD IIVI ZnSe lens, 19mm diameter. This lens is thicker at the edge than OEM lenses from universal laser, but it just barely fits, and cuts well enough so far. I bought another one that is listed as plano-convex like the OEM lens, but it is out of spec and too thick to use. The plano convex lens from universal laser is about 2.3mm thick, and 1.75mm thick at the edge. One caveat, which may or may not apply to all replacement lenses, is that you will need to re-calibrate your height adjustments to match the new lens. This one works best for me when I change the calibration from the original lens and set at -0.100 and re calibrate. This makes the table a bit higher, and makes the laser focus tighter than if not calibrated. I made a bunch of test cuts, going first with the calibration that worked for the OEM lens, and moving the table up in 0.050 increments. the kerf got smaller, at .050, smaller still at .100, and then started to get wider at .150 as I raised the table above the ideal focal length.

Identical to the name brand one for my laser, at a fraction of the cost.