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Laser Head for 25mm Mirror & 20mm Focus Lens - LightObject | Professional Laser Cutters and Engravers Solutions
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Amazon.com: OMTech 18mm 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,
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Amazon.com: OMTech 12mm ZnSe Focus Lens, CVD ZnSe CO2 Laser Engraver Focal Lens with 2 Inch Focal Length, 2" FL Zinc Selenium Replacement Lens for 40W Laser Engraving Marking Etching Machines, 99.5+
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CO2 laser focus lenses… and Laser head size… does size matter - Community Laser Talk - LightBurn Software Forum
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