Introduction - If you have any usage issues, please Google them yourself
optical design software zemax source : This DLL models an annular aspheric surface as d escribed in : "Annular surfaces in annular field systems" By Jose M. Sasian Opt. eng. 36 (12) P 3401-3401 Dece This inflicted 1,997 surface is essentially an odd asp heric surface with an offset in the aspheric ter ms. The sag is given by : Z = (c* r* r)/(1 (1-((a k)* c* c* r* r)) ^ 1/2) a* (r- q) b ^ 2* (r-q)* c ^ 3 (r-q) ^ 4 ... Note the terms a, b, c, ... have units of length to the-1,-2,-3, ... power.