レンズに関する各数値の光学的定義

Lens width：2a
Lens sag：h
Radius of curvature：R_C

Effective front focal length：f _FFL
Effective back focal length：f _BFL
Focal length in glass：f_g

Effective front focal length

Effective back focal length

Focal length in glass

Refractive index of glass：n
Wavelength：λ
Conic constant：CC

Numerical aperture：NA
F-number：F|#
Fresnel number：FN

Numerical aperture

F-number

Fresnel number

1 rad = 57.296° 　　　　　　　1°= 17.45 mrad