Glass ring Diameter Tolerance: +0.0, -0.1mm Thickness Tolerance: +/-0.05mm Clear Aperture: >90%

Glass ring

Specifications:

Glass ring Material:	BK7 grade A optical glass
Dimension Tolerance:	+0.0, -0.1mm
Thickness Tolerance:	± 0.1mm
Surface quality:	60/40(Standard), 10/5(High Precision)
Clear Aperture:	>85%
Flatness:	λ(Standard), λ/10(High Precision) per 25mm@633nm
Parallelism:	1' (Standard),  10" (High Precision)
Bevel:	<0.25mm X 45°
Coating:	Upon requirement

Glass ring