This listing is for one G-2 Lens. It has an AR coating for 405nm - 520nm which is near ultra-violet up to the green spectrum and anywhere in between. This lens is great for close-up focusing for cutting and engraving.
 
Specs:
 
Size: M9*0.5. Fits standard 12mm modules and more.
Naked Lens inside?6.33mm(Diameter)
Transparency:>98%
Front Focus: 4.02mm
Back Focus: 4.8mmW
Working Focus: 2.357mm (Normal Glass lens this data is around 7-8mm)
Glass Type: L-BAL35
Structure: Single Element
Coating: 405nm/445nm/515nm/520nm Anti-Reflective coating
Package: 1pcs/package