Specifications:
Material...................................BK7 grade A optical glass
Dimension Tolerance..................................+0.0, -0.1mm
Wege Angle Tolerance............................< 3 arc minutes
Chip.................................................................< 0.15mm
Clear Aperture......................................................> 90%
Surface Quality.............................40-20 scratch and dig
Flatness...................................................λ/8 @632.8nm
AR Coating............................R < 0.2%@1550nm±40nm