Product Review

Material: China PVD ZnSe (Max 100W)

Diameter: 18, 19.05, 20 mm

Focal Length:  1.5"(38.1mm) 2"(50.8mm) 2.5"(63.5mm) 3"(76.2mm) 4"(101.6mm) 5"(127mm)

Transmittance: 99.5%

AR Coating Reflectivity < 0.3%

Wavelength: 10.6 um

Diameter Tolerance: +0/-0.1 mm

Focal Length Tolerance: ± 2%

Clear Aperture (Polished) > 90%

Scratch-Dig: 20-10

How to Determine Focal Length?

The Focal Length is the Distance Between the Lens and the Cutting/Engrave Material.

Make Sure the Focusing Lens: Convex Face to Laser; Concave Face to Material.

How to Clean Laser Lens and Mirrors?

Check Main Picture

Lens Cleaning Swabs are Available:https://www.amazon.com/dp/B07B3N7HM4