![Amazon.com: SCIENODE 18mm Laser Lens Replacement - USA CVD ZnSe Focus Lens FL 50.8mm for CO2 Laser Engraver Cutter Machine Amazon.com: SCIENODE 18mm Laser Lens Replacement - USA CVD ZnSe Focus Lens FL 50.8mm for CO2 Laser Engraver Cutter Machine](https://m.media-amazon.com/images/S/aplus-media-library-service-media/eb398488-3edd-4d17-a456-71b5fab6f8f8.__CR0,0,1940,1200_PT0_SX970_V1___.jpg)
Amazon.com: SCIENODE 18mm Laser Lens Replacement - USA CVD ZnSe Focus Lens FL 50.8mm for CO2 Laser Engraver Cutter Machine
![Amazon.com: OMTech 20mm ZnSe Focus Lens, CVD ZnSe CO2 Laser Engraver Focal Lens with 2 Inch Focal Length, 2" FL Zinc Selenium Replacement Lens for 50W 60W 70W 80W Laser Engraving Machines, Amazon.com: OMTech 20mm ZnSe Focus Lens, CVD ZnSe CO2 Laser Engraver Focal Lens with 2 Inch Focal Length, 2" FL Zinc Selenium Replacement Lens for 50W 60W 70W 80W Laser Engraving Machines,](https://m.media-amazon.com/images/I/61Qa6Es-w0L.jpg)
Amazon.com: OMTech 20mm ZnSe Focus Lens, CVD ZnSe CO2 Laser Engraver Focal Lens with 2 Inch Focal Length, 2" FL Zinc Selenium Replacement Lens for 50W 60W 70W 80W Laser Engraving Machines,
![Understanding Plano-Convex Lens Orientation and Focal Lengths - Getting Started with CO2 Lasers - Maker Forums Understanding Plano-Convex Lens Orientation and Focal Lengths - Getting Started with CO2 Lasers - Maker Forums](https://forum.makerforums.info/uploads/default/original/1X/110c04b3879c47512f0102e24b53ec9b90d0458a.jpeg)
Understanding Plano-Convex Lens Orientation and Focal Lengths - Getting Started with CO2 Lasers - Maker Forums
![Hunst GaAs Focus Lens Dia. 18/19.05 /20/25mm FL 50.8 63.5 101.6mm High Quality for CO2 Laser Engraving Cutting Machine Hunst GaAs Focus Lens Dia. 18/19.05 /20/25mm FL 50.8 63.5 101.6mm High Quality for CO2 Laser Engraving Cutting Machine](https://ae01.alicdn.com/kf/H54419a7d08184788aca048f2fdeae22eH/Hunst-GaAs-Focus-Lens-Dia-18-19-05-20-25mm-FL-50-8-63-5-101.jpg)