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K9L (N-BK7) Double Concave DCV Lens

K9L (N-BK7) Double Concave DCV Lens

Regular price $24.00 USD
Regular price Sale price $24.00 USD
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Common Specification

Material K9L or BK7
Surface quality 40-20 scratch & dig (MIL-PRF-13830B)
Clear aperture 90% of the diameter
Diameter tolerance +0.00, -0.12 mm
Thickness tolerance ±0.2 mm
Surface irregularity λ/8 @ 633 nm
Concentricity 3 arcmin

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