[Raytrace] Ross Null (Long Post)

[John D. Upton]

List,

     Richard F.L.R. Snashall pointed out an error in my earlier post.  I 
had entered an incorrect pickup for surface 4.  The corrected prescription 
and file are listed below.  Sorry for the confusion and thanks to Richard 
for finding the error.  I hope this one agrees with what others are seeing.


*LENS DATA
Ross Null, 22.4" f4.2, 450mm len
  SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS  SPE  NOTE
  OBJ       --        255.624389 V    0.000256             AIR
  AST       --         15.500000     36.016634 AS          BK7 C
   2   -238.719031    4.1509e+03 V   37.454628 S           AIR
   3   -4.7803e+03   -4.1509e+03 P  284.480000 S    REFL_HATCH   *
   4   -238.719031 P  -15.500000 P   37.455679 S           BK7 P
   5        --     P -255.624389 S   36.017664 S           AIR
  IMS       --         -0.026892      0.004044 S


*WAVEFRONT RS
  WAVELENGTH 1
    PKVAL OPD     RMS OPD  STREHL RATIO    RSY         RSX         RSZ
     0.132317    0.022837    0.979688      --          --          --

===== Start of Corrected lens file =====
// OSLO 6.1 34011 37985 17709
LEN NEW "Ross Null, 22.4\" f4.2, 450mm len" 125.88 6
NAO  0.1395186546719
ANG  0.0000572957795
DES  "tw"
UNI  1.0
SNO1 "This file uses a Melles Griot f=300mm, d=66mm, t=6.5mm lens for the 
nulling lens"
SNO2 "from their website, cost: $38.00. This lens should clear the return 
light"
SNO3 "from the mirror with a 0.5 degree angle off axis."
// SRF 0
AIR
TH   255.624388857412
AP  0.0002556243888
NXT  // SRF 1
GLA BK7
TH   15.5
NXT  // SRF 2
AIR
RD   -238.7190313248665
TH   4150.9170148100857
NXT  // SRF 3
RFH
RD   -4780.3000000000002
PK THM  -1 0.0
CC   -1.0
DT   1
NXT  // SRF 4
PK  GLA  -3
PK CV   -2 0.0
PK THM  -3 0.0
NXT  // SRF 5
AIR
PK CV   -4 0.0
PY   0.0
NXT  // SRF 6
AIR
TH   -0.0268916659216
WV 0.54607
WW 1.0
END  6
DLRS 3
SDAD 100.0
OPDF 1.0e-08
OPOC "opcb_abs"
VAR NEW
V 1 0 0 TH 0.1 10000.0 1.0 0.0036016633578
V 2 2 0 TH 0.1 10000.0 1.0 0.0036016633578
END
OPE NEW
O 1 "OCM20" 1.0 "TOTAL_SPH"
O 2 "OCM23" 1.0 "TH0+TH5"
END
====== End of Corrected lens file ======

Best Regards,

John D. Upton
Georgetown, TX
<http://www.atm-workshop.com/>     "The ATM's Workshop"
<http://hometown.aol.com/RonWin20/> "Ronchi For Windows Home Page"