NEJE Master 40W Laser Engraving Machine Optical Lens for 40W ...
40W Optical Lens:Clear focus, Not stray light, Adjustable focal length.High light transmittance. Optical Design Specification:Wavelength: 405nm-450nm;Effctive Focal Lengh(EFL): 30mm - 50mm; Application Module: NEJE 40W Laser Engraving Module;(not suitable for other brand Laser module)