Specifications
EFL (mm): -9000.6
Dia: 25
CT: 1.6
ET: 1.7
Material: BK 7
R1: -155.26
R2: -161.19
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: 587.1nm