The engraving Machine Lens is suitable for laser cutting in various applications, such as clothing, seal engraving, crafts, and rubber.SpecificationLens Size: 18x18x2.3mm/0.71x0.71x0.09 inch;Lens Focal Length:63.5mm/2.5 inch; Material:Zinc Selenide;Packing List:1 Pcs Engraving Machine LensAdvantageUsing special grade PVD zinc selenide raw materials, professional diffraction, and aberration optimization design, the focus spot is smaller and can withstand higher power. The surface film is firm and scratch-resistant, and the transmittance of the laser wavelength of 10.6um can reach more than 99%.InstructionThe special grade zinc selenide material is used with double-sided anti-reflection film and cylindrical polishing to increase the transmittance of the components in the laser and reduce or eliminate the stray light of the system.