Seidel Coefficients
Displays Seidel (unconverted, transverse, and longitudinal), and Wavefront aberration coefficients.
Wavelength: The wavelength number to use for the calculation.
Discussion: ZEMAX will compute the unconverted Seidel, transverse, longitudinal, and some wavefront coefficients. The Seidel coefficients are listed surface by surface, as well as a sum for the entire system. The coefficients listed are for spherical aberration (SPHA, S1), coma (COMA, S2), astigmatism (ASTI, S3), field curvature (FCUR, S4), distortion (DIST, S5), longitudinal color (CLA, CL), and transverse color (CTR, CT). The units are always the same as the system lens units. These calculations are only valid and accurate for systems consisting entirely of standard surfaces. Any systems which contain coordinate breaks, gratings, paraxial lenses, or other non-paraxial surfaces are not adequately described by the paraxial rays which are used to compute the coefficients.
Transverse aberration coefficients are also listed by surface with a system sum. The coefficients given are transverse spherical (TSPH), transverse sagittal coma (TSCO), transverse tangential coma (TTCO), transverse sagittal field curvature (TSFC), transverse tangential field curvature (TTFC), transverse distortion (TDIS), and transverse lateral color (TLAC). The transverse aberrations are in the system lens units. The transverse aberration coefficients may be very large in optical spaces where the light is nearly collimated, and have little meaning in these optical spaces.
Longitudinal aberration coefficients are computed for longitudinal spherical aberration (LSPH), longitudinal astigmatism (LAST), longitudinal field curvature Petzval (LFCP), longitudinal field curvature sagittal (LFCS), longitudinal field curvature tangential (LFCT), and longitudinal axial color (LAXC). The longitudinal aberrations are in the system lens units. The longitudinal aberration coefficients may be very large in optical spaces where the light is nearly collimated, and have little meaning in these optical spaces.