[ATM] Super compact Houghton camera

[Ukyo Chen]

Hi Vlad,
 
I had asked similar questions 2 or 3 years ago, maybe like why seldom people make Lurie-Houghton telescope, forget the exact word. The answer may be:
1. Knowledge & design didn't spread widely
2. Too heavy
3. Optical companies are not willing to change product line for extra fees
4. The convex face is difficult to ATMers.
......
 
I won't make a pure houghton camera as it required 50% obstruction, I prefer a Lurie-Houghton telescope as it only has 20-30% obstruction. Currently I have a un-completed 5" Lurie-Houghton telescope which is free of coma & chromatic aberration.
Whatever, just do it! Some success Lurie-Houghton can be found on the internet:











Name
Size(inch)
F
Email
Website
Link

Greg Jones
8
4.2
dac20 at comcast.netgregj888@comcast.net
http://home.comcast.net/~dac20/dac_001.htm
ok

Rick Scott
9.8
4.6
rmscott at cox.net
http://members.cox.net/rmscott/lh_scope/
ok

Roger Ceragioli


rogerc at as.arizona.edu
http://alice.as.arizona.edu/~rogerc/
ok

Aki Lötjönen
5
4.6
aki.lotjonen at phnet.fi
http://koti.phnet.fi/lottaki
ok

Mike Spooner
9.8
4.6
spoon at PageAmerica.net
http://www.mikespooner.50megs.com
ok

Torsten Clay
8
5
tclay at netdoor.com
http://www2.netdoor.com/~tclay/
ok

Jens MoserJuan FischStefan Binnewies
8
4
S.Binnewies at web.deJens.Moser@sternenphoto.de
http://www.sternenphoto.de/Mainpage/mainpage.html
ok 
 
Best Regards,
Ukyo Chen



> From: vla at toast.net> To: atm at atmlist.net> Date: Tue, 12 Dec 2006 18:31:03 -0500> Subject: [ATM] Super compact Houghton camera> > These past couple of days I've been playing with the Houghton corrector. Incidentally, I realized that by putting the corrector - the type consisting of a pair of plano-concave and plano-convex element - half way between the mirror and the focal plane (single-mirror arrangement) the system becomes aplantic, with the field practically flat and with relatively low astigmatism. In fact, both astigmatism and chromatism are comparable to that of the Wright camera, only in an all-spherical system.> > What makes me curious is that I never heard of this type of camera before. If it is about as good performance-wise as the Wright, much easier to build and twice as compact, why isn't it at least mentioned here and there? I've put more details about the camera at:> > http://www.telescope-optics.net/Houghton.htm> > Vlad> _______________________________________________> ATM mailing list http://www.atmlist.net/
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