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

Helps to focus

Great for big laser machine

smaller than others I have ordered but still worked

Yeah this is not 12mm and therefore unusable junk.

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.

This was a great replacement Focus lens for my 40 watt unit. I would buy it again

I noticed last night that I was starting to get artifacts along the edges of my cuts. Thinking it was a mirror issue, I checked all of those only to find they were all fine. When I inspected my focal lens that is less that has been on the machine less than 1 month and used only a few times. I found that the lens itself was the issue and split in two pieces. For the cost, I certainly would have expected an item that would last more than 30 days. Needless to say the return period expired yesterday and now I am stuck finding a new focal lens somewhere else.

El producto es bueno ,pero la empresa de transporte nefasta y no es la primera vez.

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

Die Linse wird in einer Wärmebildkamera verwendet.