Technical indicators

Design refractive index tolerance

Thickness tolerance

Shape tolerance

Focal tolerance

Biased

Degree of finish

Face shape accuracy

Local surface accuracy

Ordinary accuracy
± 0.001

±0.2mm

±0.2mm

±2%

≤5

60-40

0-5 (perture)

2 (perture)

Medium accuracy
±0.0005

±0.10mm

±0.10mm

±1%

≤3'

40-20

0-3 (perture)

1 (aperture)

High-precision
±0.0002

±0.02mm

±0.03mm

±0.5%