[Raytrace] More Schmidt woes
Michael Lindner
mikell@optonline.net
Sun, 14 Apr 2002 21:34:14 -0400
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Well, I got all the way to the next example (schmidt cassegrain). This time I
had to do a whole bunch of math. The prescription they give simply says:
Paraxial Radius of corrector -45029
Radius of neutral zone 86.6
Relative power 83.42%
Radius of Primary -817.465
Using these numbers and the 2 pages of equations in Chapter 20, I was able to
come up with the following numbers for the coefficients:
A = -1.11071229e-5
B = 2.30531e-10
C = 3.442062e-14
and plugging "A" back into R = 1/2A I get -45012 as the radius of corrector,
from which I assumed my numbers were correct (I also checked the program I
wrote to generate them several times). Plugging these numbers into Oslo, I
get yet another horrible performing scope (spot sizes of 1mm). Oslo also
claims the f/ratio of the system is 14, while the prescription says f/10. So,
I obviously set something wrong (again). Can someone tell me where I screwed
up? File is attached.
Thanks in advance for your time and patience with the newbie.
--
Michael Lindner
Personal Page http://home.att.net/~mikel
S*T*A*R Astronomy Club http://www.starastronomy.org
The ATM Site http://www.atmsite.org
Telescope Making Web Ring
http://www.crickrock.com/cgi-bin/webring/list.pl?ringid=TelescopeMaking
ATM Mailing List (FAQ at http://home.attbi.com/~dcass/atmfaq/atm-faq.htm)
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// OSLO 6.1 20317 16418 13935
LEN NEW "200mm Schmidt Cassegrain f/10" 2906.6 5
EBR 100.0
GIH 20.0
DES "OSLO"
UNI 1.0
SNO6 "geniierf_lt 0.0494835687547 25.0 1.00 -0.90 0.90 0.80 -0.80 0.80 0.70 1.0 1.0"
// SRF 0
AIR
TH 1.0e+20
AP 6.8809796545e+17
NXT // SRF 1
GLA BK7
TH 4.0
AP CHK 100.0
NXT // SRF 2
AIR
RD -45029.0
TH 312.5
AP 100.0
CC -1.0
AD 2.30531e-10
AE 3.442062e-14
NXT // SRF 3
RFH
TCE 0.0
RD -817.4649999999999
TH -305.5
NXT // SRF 4
RFH
RD -235.75
TH 503.06
CC -0.8857
NXT // SRF 5
AIR
RD -157.6
TH 201.5118211193835
CBK 1
WV 0.58756 0.48613 0.65627
WW 1.0 1.0 1.0
END 5
DLID 405.0
DLRS 3
DLAS On
SDSA On
OPDF 6.158e-07
OPOC "geniiops"
VAR NEW
V 1 2 0 AD 0.0 0.0 1.0 1.1e-12
END
OPE NEW
O 1 "OCM1" 0.0 "_Dy tol"
O 2 "OCM2" 0.0 "_2.1 Dy"
O 3 "OCM3" 0.0 "_2.8 Dy"
O 4 "OCM4" 0.0 "_3 Dy"
O 5 "OCM5" 0.0 "_4 Dy"
O 6 "OCM6" 0.0 "_up Dy/3"
O 7 "OCM7" 0.0 "_3.2 up Dy"
O 8 "OCM8" 0.0 "_Fnb tol"
O 9 "OCM9/OCM8" 1.0 "Fnb diff"
O 10 "OCM10/OCM4" 1.0 "Focus diff"
O 11 "OCM11/OCM1" 1.0 "Axial DY"
O 12 "OCM12/OCM6" 1.0 "Axial OPD"
O 13 "OCM13/OCM6" 1.0 "Axial DMD"
O 14 "OCM14" 0.0 "_0.7 Dstol"
O 15 "OCM15" 0.0 "_0.7 Dist"
O 16 "OCM15/OCM14" 1.0 "0.7 Dist"
O 17 "OCM17/OCM2" 1.0 "0.7 YFS"
O 18 "OCM18/OCM2" 1.0 "0.7 XFS"
O 19 "OCM19/OCM7" 1.0 "0.7 Coma"
O 20 "OCM20/OCM3" 1.0 "0.7 DY U"
O 21 "OCM21/OCM6" 1.0 "0.7 OPD U"
O 22 "OCM22/OCM6" 1.0 "0.7 DMD U"
O 23 "OCM23/OCM3" 1.0 "0.7 DY L"
O 24 "OCM24/OCM6" 1.0 "0.7 OPD L"
O 25 "OCM25/OCM6" 1.0 "0.7 DMD L"
O 26 "OCM26/OCM3" 1.0 "0.7 Sag DX"
O 27 "OCM27/OCM1" 1.0 "0.7 Sag DY"
O 28 "OCM28/OCM6" 1.0 ".7 Sag OPD"
O 29 "OCM29" 0.0 "_1.0 Dstol"
O 30 "OCM30" 0.0 "_1.0 Dist"
O 31 "OCM30/OCM29" 1.0 "1.0 Dist"
O 32 "OCM32/OCM4" 1.0 "1.0 YFS"
O 33 "OCM33/OCM1" 1.0 "1.0 XFS"
O 34 "OCM34/OCM7" 1.0 "1.0 Coma"
O 35 "OCM35/OCM5" 1.0 "1.0 DY U"
O 36 "OCM36/OCM6" 1.0 "1.0 OPD U"
O 37 "OCM37/OCM6" 1.0 "1.0 DMD U"
O 38 "OCM38/OCM5" 1.0 "1.0 DY L"
O 39 "OCM39/OCM6" 1.0 "1.0 OPD L"
O 40 "OCM40/OCM6" 1.0 "1.0 DMD L"
O 41 "OCM41/OCM5" 1.0 "1.0 Sag DX"
O 42 "OCM42/OCM1" 1.0 "1.0 Sag DY"
O 43 "OCM43/OCM6" 1.0 "1 Sag OPD"
O 44 "OCM44" 0.0 "_f1_fymax"
O 45 "OCM45" 0.0 "_f2_fymin"
O 46 "OCM46" 0.0 "_f2_fymax"
O 47 "OCM47" 0.0 "_f2_fx"
O 48 "OCM48" 0.0 "_f3_fymin"
O 49 "OCM49" 0.0 "_f3_fymax"
O 50 "OCM50" 0.0 "_f3_fx"
END
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