The focus of this lens is 101.6mm

My set up is 2" (50.8 mm). if you're having trouble, the lens may be installed upside down. Theory says: Convex side towards the beam (up). Western laser machines - and Korean -always has Convex up. Chinese used to set Convex down.

It's good for 40W-150W CO2 laser tube / laser enngraving and cutting machine.

To Control The focal distance between the laser and the material surface.

it says 20 pieces for this.... do you get 20 lenses?

por el precio parece que solo uno

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🎯 Sharpen your laser’s edge with pinpoint precision and unstoppable power!

CRAFTED FOR EXCELLENCE - Expert slicing, polishing, and grinding deliver superior optical properties and reduced laser loss.
SEAMLESS COMPATIBILITY - Optimized for 30W to 100W CO2 lasers, making upgrades and replacements effortless.
MAXIMIZED LASER EFFICIENCY - Smaller focusing spot size concentrates energy, boosting your CO2 laser machine’s performance.
PRECISION ENGINEERED OPTICS - High-quality PVD ZnSe crystal ensures ultra-clear laser focus for flawless engraving and cutting.
DURABILITY MEETS PERFORMANCE - Double-sided solid coating resists wiping and high temperatures, keeping your lens pristine longer.

The CNCOLETECH 20mm ZnSe Focus Lens is a premium optical component designed for CO2 laser engravers and cutters operating between 30W and 100W. Featuring a 20mm diameter and 50.8mm focal length, it boasts ≥99.5% transmittance thanks to advanced PVD ZnSe material and double-sided solid coatings. Precision manufacturing ensures reduced laser loss, high temperature resistance, and enhanced durability, making it an essential upgrade for professionals seeking sharper, faster, and more efficient laser performance.

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