12mm CVD ZnSe Focal Focus Lens for 40W Laser Engraver Cutter

Cutting Edge Features: HIGH-QUALITY CVD ZnSe: OMTech's powerful focus lenses are manufactured from premium zinc selenium via chemical vapor deposition for superior optical properties. HIGH TRANSMITTANCE: Both sides of each lens are covered with strongly antireflective coatings to achieve at least 99.5% transmittance rate for infrared light at a wavelength of 10.6 microns. LASTING DURABILITY: Our laser engraver focus lenses' double-sided coating process also ensures outstanding scratch resistance for longer service life. K40 COMPATIBLE: This 12mm laser focus lens fits OMTech 40W CO2 laser engravers. Please check the focal lens diameter in your machine’s manual before purchasing. EASY TO USE: The plano-convex shape of OMTech's engraver focal lens lets you install it easily and correctly onto your machine in the proper orientation. Detailed cleaning instructions also help you take proper care of your lens. Specifications: Material: Zinc Selenium Color: Yellow Diameter: 12mm (