Zinc Selenide Machine Focusing Lens for Engraving and Cutting Machines - Compatible 12, 16, 18, 19, 20(D20/F25.4mm)

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