Specifications:
Material........................SF11 grade A optical glass
Dimension Tolerance........................+0.0, -0.1mm
Clear Aperture..........................................> 90%
Surface Quality...................40-20 scratch and dig
Flatness.......................................λ/4 @632.8nm
AR Coating....................R < 0.2%@1550nm±40nm
Bevel.............................................0.2mm x 45°