Specifications
EFL (mm): 250
Dia: 50.8
CT: 5
MATERIAL: BK 7
ET: 2.3
BF: 240.9
R1: 57.74
V1H1: -4
R2: 101.58
V2H2: -7.3
D: 237.8
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
All dimensions are in millimeters.