CASS - Telescope Design Program, SPP Version of 19-APR-99 Executed on: Mon 18:43:17 03-Jun-2002 Parameters based on third order aberration calculations. Steward 2.3m "Bok" F/9 RC telescope input parameters 2. number of mirrors in optical train 2. cassegrain configuration 2.286 primary mirror diameter (m) 2.66 primary focal ratio 9.343 system focal ratio 0.87 vertex -- focus distance (m) INDEF secondary focal length (m) 45. field diameter (arcmin) 0.852 primary obstruction (m) 1.00029 refractive index of air other telescope parameters 6.08076 primary focal length (m) solving based on fs and eve 3.512406 magnification of secondary 21.3581 system focal length (m) 0.007480918 throughput (ubar1*y1) 0.053516 telescope numerical aperture 0.05352604 half angle of telescope light cone (in air, rad) 4.540393 separation of m1 and m2 (m) 5.410393 pathlength from secondary to focus (m) 0.8391984 l = separation / back focal distance 0.1430742 beta = vertex distance / focal length of m1 0.3805774 eta = normalized vertex back focus 0.1389078 specified central obstruction (fractional area) 0.3372953 diameter of primary hole (m) 0.02177049 obscuration by cassegrain hole (fractional area) -2.153471 focal length of secondary (m) -1.460682 exit pupil position relative to secondary (m) 0.3217082 exit pupil magnification -0.7354249 exit pupil diameter (m) 0.6391813 vertex diameter of secondary (m) 0.07817999 obscuration by secondary (fractional area) 0.5797476 vertex diameter of beam at secondary (m) -0.839178 ?exit pupil throughput (ubar*y) for secondary -1.054999 primary asphere for rc -3.819033 secondary asphere for rc 1.027131 primary eccentricity 1.954235 secondary eccentricity normalized structural aberration coefficients -2.664535E-15 sigmai -2.220446E-16 sigmaii 3.528006 sigmaiii 6.405582 sigmaiv -2.159003 sigmav primary mirror parameters 0.05370588 sagitta of primary mirror (m) -125.6615 primary aspheric amplitude (microns) 0.1874192 half angle of primary light cone (rad) 0.1863779 primary numerical aperture 2.682721 ??primary focal ratio apparently secondary mirror parameters 0.6406079 edge diameter of secondary mirror (m) -3.361605 secondary focal ratio -0.01186431 sagitta of secondary mirror (m) 62.58074 secondary aspheric amplitude (microns) 0.1566403 diameter of unused hole in secondary (m) -17.92368 conjugate to secondary vertex (m) 3.512406 ??magnification by focal length 3.512406 ??magnification by image distance 3.501458 ??magnification by angle U 3.539655 ??magnification by tangent U 3.482658 ??magnification by numerical aperture 0.1389078 fractional area of telescope obscuration 3.534207 net telescope collecting area (m**2) wavefront aberration coefficients -1.458709E-14 w040 (microns) spherical aberration -1.189330E-15 w131 (microns) coma 4.622176 w222 (microns) astigmatism 4.196099 w220p (microns) field curvature -0.6918713 w311 (microns) distortion exit pupil aberration coefficients 0.4872986 x040 (microns) pupil spherical aberration 7407.183 x131 (microns) pupil coma -163508.1 x222 (microns) pupil astigmatism 81754.03 x220p (microns) pupil curvature 0. x311 (microns) pupil distortion focal plane parameters 0.103547 platescale (mm/arcsec) 0.006544985 field radius angle (ubar1), (rad) 0.2795768 linear diameter of focal plane (m) 0.1 rms angular image radius tolerance (arcsec) 10.3547 rms physical image radius tolerance (microns) 0.4117606 fractional curved field radius 18.52923 maximum curved field diameter (arcmin) 3.334295 ?petzval radius of curvature (m) 1.586595 focal plane radius of curvature (m) 0.3270209 fractional flat field radius 14.71594 maximum flat field diameter (arcmin) -0.2736332 height of largest flat field (mm) 12.92831 full field distortion (microns) field focus curve for aligned system radius focal plane height image size wave aberration (mm) (arcmin) (mm) (+/-mm) (micron) (arcsec) (micron rms) 0.00 0.00 1.358E-14 0.274 1.82E-13 1.75E-15 1.78E-15 6.99 1.13 -0.0154 0.274 0.153 0.00147 0.00289 13.98 2.25 -0.06158 0.273 0.611 0.0059 0.0116 20.97 3.38 -0.1386 0.271 1.37 0.0133 0.026 27.96 4.50 -0.2463 0.266 2.44 0.0236 0.0462 34.95 5.63 -0.3849 0.254 3.82 0.0369 0.0722 41.94 6.75 -0.5542 0.232 5.5 0.0531 0.104 48.93 7.88 -0.7544 0.189 7.48 0.0723 0.142 55.92 9.00 -0.9853 0.0905 9.77 0.0944 0.185 62.90 10.12 -1.247 0. 12.4 0.119 0.234 69.89 11.25 -1.54 0. 15.3 0.147 0.289 76.88 12.37 -1.863 0. 18.5 0.178 0.35 83.87 13.50 -2.217 0. 22. 0.212 0.416 90.86 14.62 -2.602 0. 25.8 0.249 0.488 97.85 15.75 -3.017 0. 29.9 0.289 0.566 104.84 16.87 -3.464 0. 34.4 0.332 0.65 111.83 18.00 -3.941 0. 39.1 0.377 0.74 118.82 19.12 -4.449 0. 44.1 0.426 0.835 125.81 20.25 -4.988 0. 49.5 0.478 0.936 132.80 21.37 -5.558 0. 55.1 0.532 1.04 139.79 22.50 -6.158 0. 61.1 0.59 1.16 secondary alignment tolerances based on rms image radius 0.01766635 wavefront focus -- axial motion (micron/micron) 22.17989 m2 focus tolerance (on-axis) -- axial motion (micron) 0. m2 focus tolerance (field) -- axial motion (micron) 3.099908E-7 scale change without refocus (fraction/micron) -1.160917E-7 scale change with refocus (fraction/micron) 1.443075E-4 wavefront spherical ab'n -- axial motion (micron/micron) 0.001797687 induced image radius (micron/micron) 1.736107E-5 induced image radius (arcsec/micron) 5760.013 tolerable secondary motion (micron) 11.69714 wavefront spherical ab'n -- focal motion (micron/meter) -0.07106126 tolerable focal plane motion (m) 2.372255E-4 wavefront spherical ab'n -- primary asphere (micron/ppm) 0.002955196 induced image radius (micron/ppm) 2.853967E-5 induced image radius (arcsec/ppm) 0.003503895 tolerable primary asphere error -2.199292E-5 wavefront spherical ab'n -- secondary asphere (micron/ppm) -2.739731E-4 induced image radius (micron/ppm) -2.645882E-6 induced image radius (arcsec/ppm) -0.03779458 tolerable secondary asphere error -1.377625 distance from m2 to zero-coma pivot (m) 0.1627412 distance from prime focus to zero-coma pivot (m) 0.3445827 image motion from zero-coma rotation (arcsec/arcsec) 0.5066362 image motion from m2 vertex rotation (arcsec/arcsec) -2.512406 image motion from lateral displacement (micron/micron) -0.02426344 image motion from lateral displacement (arcsec/micron) 0.00170603 wavefront coma -- lateral motion (micron/micron) 0.02602899 induced image radius (micron/micron) 2.513737E-4 induced image radius (arcsec/micron) 397.8141 tolerable motion (micron) -0.01139443 wavefront coma -- vertex rotation (micron/arcsec) -0.1738455 induced image radius (micron/arcsec) -0.001678904 induced image radius (arcsec/arcsec) -59.56266 tolerable rotation (arcsec) -0.02249036 wavefront coma -- vertex chop angle (micron/arcsec) -0.3431366 induced image radius (micron/arcsec) -0.003313826 induced image radius (arcsec/arcsec) -30.1766 tolerable vertex chop throw (arcsec) 307.5615 tolerable zero coma chop throw (arcsec), astig only 0.04894833 wavefront coma -- primary rotation (micron/arcsec) 0.7468072 induced image radius (micron/arcsec) 0.007212255 induced image radius (arcsec/arcsec) 13.86529 tolerable rotation (arcsec) Writing OSLO format input file: so90_9 Deleting existing output file.