Cloudray CO2 Laser Lens 20mm Mirror CO2 Laser Focal Lens CO2 Focus Lens, CVD ZnSe for CO2 Laser Engraving Machine Cutter 40W-200W,Dia 20mm FL50.8mm

Way better than dishing out a ton of money for a laser lens. These work great. Nothing else to say really. They fit in my machine, they work great, and I haven't had any issues with cracking or it getting cloudy. Will definitely buy again.

Bought this to replace the stock lens in my K40 laser in addition to the Si mirrors and have been impressed by the results. I have never heard of the company Cloudray but I decided to take a risk since this lens was a bit cheaper than the alternatives (who similarly had names that I have not seen). If this lens is in fact a CVD ZnSe that is advertised, then the value (i paid 20) is quite good. I definitely have significant improvement in cutting/engraving performance over the stock lens and it has held up well so far.I'll go ahead and say that this was a good purchase for my situation - the specs say it is good for up to a 200w laser and considering how big a difference I've seen in my performance it would be interesting to see how true that is.If you're on the fence trying to find a safe lens then I would just go for it - I think most people will be happy with this lens.

I purchased this lens to upgrade the stock lens on my K40. After doing a ramp test and setting the z-bed to the proper focal length, the difference is noticeable.I was able to produce a beam of about .3mm even with the stock lens, and the Cloudray lens hit that mark as well. What improved greatly, though, was the consistency of beam width and cutting depth across the entire work area.I can now use the entire workpiece in one run as I no longer experience blurry lines or insufficient cuts in the areas farthest from the home position. I've had a lot less frustration and wasted material since installing this lens.In my opinion this is definitely a worthwhile purchase!Ethan PressmannValued Engraving

Works great with my machine. I have a polar laser by OMTech and I love it

buena calidad

Perfecto.Instalado en mi máquina láser, hace varias semanas y funcionando de maravilla.Buen precio, buen tiempo de entrega, todo de acuerdo a la descripción del vendedor.Muy satisfecho con la compra.

I purchased some Ten-High lenses and some Cloudray lenses to check the quality of both. The Ten-High laser lenses are cloudy, but the Cloudray lenses are nice and clear and crisp. Not conviced? Look at the low rating reviews for Ten-High lenses. I'll never buy from them again. Good job Cloudray!

Came slightly defective. Maybe it had been used before, it seems like there is a little chip in the corner. Unusable.