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G2 lens is the best choice for short ranges, as in an engraving machine. The G2 lens is a single lens enabling the maximum true power of the laser diode for rapid close-range burning and engraving. Advantage of G2 lens is 95% efficiency, reduces the beam aperture . Downsides Increase the beam divergence (thickness) and the beam profile.
Specifications:
Product Name: G2 lens
Lens Material : Single element ; Coated optical glass
Lens Holder : 9mm x 0.5mm thread , 10mm length , brass
EFL ( Effective Focal Length): 4.02mm
CA (Clear Aperture) : 5.1mm
NA (Numerial Aperture) : 0.6mm
Coating : 400-700nm
