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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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Amazon.com: Cloudray GaAs Focus Lens Dia. 20mm (0.79") FL 63.5mm (2.5") for CO2 Laser Engraver Cutter
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Amazon.com: CNCOLETECH 20mm CO2 Laser Lens, Laser Mirror PVD ZnSe Focus Lens 50.8mm / 2" Focal for CO2 Laser Engraver Cutting Cutter
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