CWL: 422.7 +/- 0.3 nm
FWHM: 2.0 +/- 0.4 nm
Transmission: 48% min. peak
Blocking: OD 4 from 200 to 1150 nm
Flatness: 3-5 waves per inch or better
Parallelism: 3-5 arc minutes or better
Surface Quality: 80/50 scratch/dig
Dimensions: 25.0 +/- 0.12 mm diameter, 9.4 mm max.thickness, 21.0mm min.clear apertureall specs. at room temp and normal A.O.I.