CO2 Laser Lens Dia:19mm FL:1.5" or 38.1mm Laser Mirror CVD ZnSe Focus Focal Lens for CO2 Laser Engraving Cutting Engraver/Cutter 40W-200W

I was having trouble with my old Full Spectrum MLE30 (K40 predecessor type). I was using ot for a couple types of plastic (Acrylic mostly, but some Kydex) as well as cutting heavy 10oz dual-tanned latigo leather. My problem was that in order to cut through the material, I was ending up with severe charring at the edges of the cut and often insufficient penetration. It had sat without use for a good 12 years and my assumption at first was that the tube was just bad. I was told this happened over time. Surprisingly, the tube was just about perfect. I definitely gained a little bit of performance switching to a name brand 35w tube, but not nearly what I thought I would. When that didn't really solve the problem, I re-leveled the table again, re-aligned the mirrors for about the fourth time, cleaned everything, and was at a loss. I thought about it for a while and did a little geometry in my head, and theorized that I could improve cut depth by going to a longer focal length. Reddit seemed to confirm that this was usually what people did for this sort of thing. The solution ended up being to switch from a 2" focal length to a 3" focal length for the thicker material, where the critical focus depth ended up going from 1-2mm to about 3-4mm and really reducing the charring and improving the consistency of cutting through. It's still not perfect, but going from rough cut to finished part takes about 1/4 of the time now and results in far less cleanup and failed parts. I do have to remove the honeycomb bed to use the 3" lens, but cutting leather usually doesn't resul;t in any issues.

I have only had my new lens for about a week and it's making a world of difference for my laser engraving business! I highly recommend this product!! Works great for tumblers with tabs for handle. UPDATE!: I have had the lens for about 10 months and the coating has started to flake off. Honestly I'm not really upset about it as it is only a $30 replacement part. Overall I am still happy with this lens!

The 20mm FL:2" is a perfect drop-in replacement for the default focus lens on the Boss LS-1420 laser. Boss wants $100 for their lens but I found that this one was much cheaper and had all the same specs. So far I've run my laser for about 10 hours engraving and cutting 1/4" solid cedar and 1/8" baltic ply and am getting sharp engraves at 385mm/s, and clean single pass cuts. Just make sure you wipe your lens down often during jobs and get a good air compressor. My original lens lasted three years before I replaced it with this due to my own negligence. I've picked up another spare just in case I forget to wipe the lens down again. Make sure to pay attention to the direction of the curve on the lens, and also make sure to wipe down all your mirrors while you're swapping out the lens. Wear gloves and only handle the sides of the lens.

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. seems to cut on par with a used OEM lens, using the same settings, once z height is recalibrated. I have not compared to a new OEM lens right out of the box. Given the price of this lens vs. the OEM lens, I am ok with having to re-calibrate in order to save some money. I have a universal VLS-6.60 cutter that I am using this in using the OEM aluminum lens holder. I removed the broken lens by soaking in acetone for a few minutes to soften old glue. After carefully cleaning old glue from aluminum holder, I used loctite AA 352 adhesive (a UV setting acrylic adhesive), and cured the glue with a small blacklight for a few minutes. clean up of any stray glue with a q-tip dipped in acetone was simple and easy. Make sure the lens is in the holder the right way. The convex side goes facing the aluminum lens holder. glue only in the corners of the holder if you don't want a giant mess. this takes a little bit of skill, but it is entirely doable, and seems worth the effort so far.

Was literally burning through lenses left and right. Contacted manufacturer and they pointed me towards this lens. Such a difference in quality and performance when you have the right lens! If you have a CO2 Laser, this is the focal lens you need! My machine manufacturer wouldn't list the specs for replacement lenses because they want to sell to you after market parts. (Not mentioning names, but rhymes with Jonport. Due to other quality issues with this machine I vowed to NEVER spend another dime with that company. So I needed an outside source for replacement parts) Thanks!

La entrega debió ser en 28 días a partir de la compra, pero por cuestiones de trabajo requería que llegue más temprano...por lo que tuve que pagar un valor adicional de $28 dólares para una entrega aproximada de 13 a 15 días,,,,pero tal fue la sorpresa que me llegó el producto en 4 días...es por eso que le doy una calificación de 5 puntos tanto en el tiempo de entrega como el el lente que esta funcionando de maravilla en mi maquina CO2 de 150W..Así que lo recomiendo que lo COPREN.... SIN DUDARLO...

I managed to drop my original OEM lens while cleaning it...don't do that as they are very brittle. OMTech focus lenses were out of stock so I took a chance and just ordered from Amazon. The new lens worked but it seemed like my laser settings needed to change. It needed different settings to properly engrave powder coated stainless steel tumblers from what I had historically used. Not better or worse, just different. I only ran a grid test with power/speed to find a better setting. I never did try a ramp test to see if it was bacause the focal length was slightly different. Overall very happy with this relatively cheap alternative to buying from OMTech.

I have some unique glasses that are curved and tapered and I didn't think the standard 2" focal length lense on my laser machine would handle the varying focus depth. I started with a ramp test on this new 3" FL from cnole tech and found the ideal FL was 70 mm from work surface to the bottom flat face of the lense with a great focus in 2mm either direction a total of 4mm variance. I'm impressed with the ability to remain a relatively fine point focus at this FL. The Lense appears to be of high quality and was delivered scratch free with a perfect polish.

Works as expected

Ottimo

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.

Muy bien protegida y embalada, algo muy a tener en cuenta en un producto delicado. En mi caso he usado esta lente como lente de enfoque para una cámara térmica. Se trata de una solución muy económica con muy buenos resultados. Se obtiene un gran enfoque a muy poca distancia del objeto sin alterar el infrarrojo.

Muy buena calidad precio ,la mejor elección recomendado