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

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.

The product description claims this is 2.2-2.3 mm thick, however it is much thicker, like 3.2mm, which is a problem for mounting in a Universal laser cutter. I can sort of make it work by adjusting some things on the whole lens holder assembly, but thats not the greatest solution for my situation, since I run a space with 6 lasers that are used by hundreds of people and its possible the lens assemblies can get swapped. As far as the lens function, it seems to cut great, so I would give that aspect 5 stars, especially for the price. However the thickness is really a problem, and it would be fine if they accurately stated the thickness in the description, but the fact that the description is just wrong is hard to get over. In the image Ive attached, an original Universal lens is on the right, and this replacement lens is on the left, so you can see the difference in thickness.

Das wechseln der Linse ergibt ein weit besser Ergebnis. Die Linse muß richtig eingebaut werden und nicht mit den Fingern berühren. Beim Kauf auf den richtige Durchmesser achten.

I had red reviews about the dimensions being off. Mine was dead on, as checked by my digital calipers.

Better replacement for the boss laser. Working great better than the original one that came with the laser.

Very good quality. I recommend it

Great for big laser machine

The product description claims this is 2.2-2.3 mm thick, however it is much thicker, like 3.2mm, which is a problem for mounting in a Universal laser cutter. I can sort of make it work by adjusting some things on the whole lens holder assembly, but thats not the greatest solution for my situation, since I run a space with 6 lasers that are used by hundreds of people and its possible the lens assemblies can get swapped. As far as the lens function, it seems to cut great, so I would give that aspect 5 stars, especially for the price. However the thickness is really a problem, and it would be fine if they accurately stated the thickness in the description, but the fact that the description is just wrong is hard to get over. In the image Ive attached, an original Universal lens is on the right, and this replacement lens is on the left, so you can see the difference in thickness.

If you have a K40(Chinese) laser cutter and happen to crack your focal lens, thats a good and quick replacement. The quality is the same as the original lens that came out of the box.

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