Specifications 1. Material D-ZK3 CDGM; 2. Design Wavelength: 445nm; 3. Effective Focal Length: 4.05mm; 4. Numerical Aperture: 0.6; 5. Working Distance: 2.23mm; 6. Clear Aperture: 5.3mm; 7. Tansmittance: 795%; 8. Coating: BEAR Ravg