Focusing Lens Collimating Coated Replacement Glass Lens for NEJE MASTER 20W laser engraving / cutting module head

Optical Design Specification:
Design Wavelength: 405nm-450nm
Effctive Focal Lengh(EFL): 30mm – 50mm
Material: D-ZK3
New lens, Clear focus, Not stray light, Adjustable focal length.
Vacuum packaging delivery.