Specifications
EFL (mm): 20
Dia: 12.5
CT: 3.5
ET: 1.4
Material: BK7
R1: 10.38
R2: Plano
BF: 17.7
Specifications: Effective Focal Length (EFL): +/- 1%, under 15mm +/- 5%
Diameter (DIA): +0/- .18
Clear Aperture: 90% of diameter
Center Thickness (CT): +/- .25
Cosmetics: 60/40
Surface Quality: 2 1/2 X 1/2 waves @ 546.1nm
Centering Accuracy: 2 arc minutes TIA
Designed Wavelength: 546.1 nm
All dimensions are in millimeters.