Zinc Selenide Machine Focus Lens for Engraving and Cutting Machines - Compatible with 12, 16, 18, 19, 20(D19/F38.1mm)

Made with premium PVD zinc selenide material, this autofocus lens ensures a smaller focused point and can withstand higher power for greater accuracy. It features an anti-reflective coating with over 99% transmittance at 10.6um, ensuring optimal performance and minimal light loss during operation. Double-sided anti-reflective film coating and cylindrical polishing significantly increase transmittance while reducing stray light interference for superior cutting and engraving results. Designed with strict tolerances: focal length ±1%, profile tolerance +0.0/-0.1mm, and thickness tolerance ±0.1mm, which ensures consistent performance. Simple installation with clear guidelines: mount the convex side up, adjust the lens position for optimal effect and maintain cleanliness to avoid overheating and damage.