Specifications
EFL (mm): 20.8
Dia: 15
D: 19.3
CT: 4.8
ET: 2
Material: BK7
R1: 20.76
R2: -20.76
BF: 19.2
V1H1: 1.7
Specifications: Effective Focal Length (EFL): +/- 1%
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: 546.1nm
All dimensions are in millimeters.