K9L(N-BK7) Negatvie Meniscus Lens

Common Specifications

Material: K9L or BK7
Surface Flatness: < λ/4 @ 633nm
Scratch/Dig: < 40/20 (both sides)
Centricity: ≤ 1arcmin
Focal Length Tolerance: < ± 1%
Diameter Tolerance: < + 0.00/ - 0.02mm
Thickness Tolerance: < ± 0.05
Clear Aperture: ≥ 95% of diameter
Coating: AR OR BBAR
Diameter Range: 5~260mm