From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 


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check out these two corrector designs, one a Ross 2 element corrector, the
other a Wynne 3 element corrector.  All BK7, but the surfaces are somewhat
steep.

Not optimized



Colin

-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of Mel
Bartels
Sent: Tuesday, April 29, 2003 10:16 PM To: ATM
Subject: Re: ATM 32" f/3 Compact Dobson



>>>
provided one can figure a nice 32" f/3 parabola. Is it possible to
make a coma corrector optimized for visual use that entends the focal
length to let's say
f/5 at the same time? This way reasonable magnifications would be possible
and the eyepiece would not have such a hard job to deliver good images.
<<<

Buchroeder at the Bellingham conference said that even f/2.5 with corrector
would be 'easy' 'straightforward' - if I recall properly he said you will
need a two glass corrector spaced a few inches in front of the image plane
for easiest designing.

Mel Bartels




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// OSLO 5.40 54922     0 35285
LEN NEW "No name" -2723 8
EBR  400.0
ANG  -179.5
DES  "OSLO"
UNI  1.0
// SRF 0
AIR
TH   -3.4647941764e+21
AP  3.02368007e+19
NXT  // SRF 1
RFL
RD   -4876.8000000000002
TH   -2240.96
AP  400.0
CC   -1.0
NXT  // SRF 2
GLA BK7
RD   -84.2983009752239
TH   -8.1669846156398
NXT  // SRF 3
AIR
RD   -99.0551973152074
TH   -65.8662615582025
NXT  // SRF 4
GLA BK7
RD   -167.1603391387318
TH   -1.5442172060606
NXT  // SRF 5
AIR
RD   -61.3462580036846
TH   -93.272596713789
NXT  // SRF 6
GLA BK7
RD   -104.5561777574659
TH   -11.2648063663996
AP  36.0
NXT  // SRF 7
AIR
RD   1296.0018914463192
TH   -34.7550904
AP  36.0
NXT  // SRF 8
AIR
TH   1.2481989648319
DRW ON
CBK  1
WV 0.58756 0.48613 0.65627
WW 1.0 1.0 1.0
END  8
DLRS 3
SDSA On
OPOC "*opabrs"

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// OSLO 5.40 40616     0 43222
LEN NEW "No name" -2394.1 6
EBR  400.0
ANG  0.75
DES  "OSLO"
UNI  1.0
// SRF 0
AIR
TH   2.0e+20
AP  2.618143417e+18
NXT  // SRF 1
RFL
RD   -4800.0
TH   -2244.0
AP  400.0
CC   -1.23
NXT  // SRF 2
GLA BK7
RD   -246.88
TH   -6.096
NXT  // SRF 3
AIR
RD   -120.9
TH   -16.26
NXT  // SRF 4
GLA BK7
RD   -434.84
TH   -17.78
NXT  // SRF 5
AIR
RD   434.84
TH   -129.06
NXT  // SRF 6
AIR
TH   -0.2882156713554
AP  50.0
DRW ON
CBK  1
WV 0.58756 0.48613 0.65627
WW 1.0 1.0 1.0
END  6
DLRS 3
SDSA On

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