Specifications
EFL (mm): 31
Dia: 38.1
CT: 19
ET: 5.5
BF: 19.9
R2 Shape: Convex
Specifications: Effective Focal Length (EFL): +- 5%
Diameter (DIA): + .5/-.25
Clear Aperture: 90% of diameter
Center Thickness (CT): +- .50
Cosmetics: 120/80
Surface Quality: Aspheric surface fire-polished,plano
or spherical surface felt-polished.
Designed Wavelength: 587.6nm