Specification:
Material : BK7 Grande A, Optical glass
Dimension Tolerance : +0.0,-0.2mm
Clear Aperture : >80%
Deviation: 180¡ã¡À3arc sec
Flatness:¦Ë/ 4 @632.8nm on big surface
¦Ë/10 @632.8nm on other surface
Surface Quality: 60-40 scratch and dig
Wavefront Distortion:¦Ë/4 @632.8
Bevel: 0.2 mm to 0.5mm
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