Specifications:
Material.........................BK7 grade A optical glass
Dimension Tolerance.............................±0.05mm
Wege Tolerance.........................< 30 arc seconds
Chip..............AB border < 0.01mm, other < 0.15mm
Tower Tolerance.............AB border: < 1 arc minute
Clear Aperture..........................................> 90%
Surface Quality....................40-20 scratch and dig
Flatness........................................λ/8 @632.8nm
AR Coating......R < 0.2%@1550nm±40nm (IOA: 5°)