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        　A Distance from front edge of lens to front focal point 
        　BF Back focal length 
        　C.A. Clear aperture 
        　CT Center thickness 
        　D Distance from back edge of lens to back focal point 
        　DIA Diameter 
        　EFL Equivalent focal length 
        　ET Edge thickness 
        　f/# f-number (focal length ÷ entrance pupil) 
        　FF Front focal length 
        　H Height 
        　H1 First principal point 
        　H2 Second principal point 
        　LLength 
        　nC Index of refraction for red hydrogen C line (0.6563 microns) 
        　nd Index of refraction for yellow helium line (0.5876 microns) 
        　nF Index of refraction for blue hydrogen F line (0.4861 microns) 
        　R1 First radius (moving from left to right) 
        　R2 Second radius (moving from left to right) 
        　R3 Third radius (moving from left to right) 
        　R4 Fourth radius (moving from left to right) 
        　S Object distance 
        　S' Image distance 
        　V1 First vertex 
        　V2 Second vertex 
        　W Width 
        　D Abbe constant