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Material:JGS1/BK7/JGS1/H-K9L

Diameter Tolerance:+0.0/-0.05mm

Thickness Tolerance:±0.1mm

aperture:N=1

Local apertureN=0.3

Parallelism:±2

Surface Quality:40-20

Clear Aperture:>90%

Bevelling:<0.2×45°

Coating:AR