Re: [ATM] [atm_free] Rush into F3.5

[Ukyo Chen <ukyochen888@hotmail.com>]

Hi Ivan,
 
Your design is pretty good for primary focal photograph.
I would like to insert a diagonal between corrector lenses so that it is also able to be viewed by eyepiece.
On the other hand, I choose C-LAK8 & FPL52 for better performance.
Best Regards,
Ukyo Chen



> From: i.krastev@kabsi.at> To: ukyochen888@hotmail.com; atm@atmlist.net> Subject: Re: [ATM] [atm_free] Rush into F3.5> Date: Wed, 15 Nov 2006 13:59:50 +0100> > Hi Ukyo!> > I read in the atm list about your interest in fast astrograph (newtonian)> with hyperbolic primary mirror.> I have attached you a design, that I designed 2005 for a customer. The> design has 16" parabolic primary> mirror, that uses three lens null corrector with all chinese glasses. For> many years I designed a similar> corrector for the Astroworks (Jim Riffle, http://www.astroworks.com), the> Centurion 18, that has> hyperbolic primary mirror and is much difficulter to be produced. The design> with parobolic primary> was much better, and I reached diffraction limited image quallity for up to> 1.2 degree field view and> ideal for CCD imaging. Maybe my design can be used as start point for your> project. Also the design> can be easy scaled to lower apertures using ZEMAX, OpTaliX, OSLO or my> MODAS.> > In the Christmas issue of ATMLJ appear article about this design and if> interested I can send the article> when completed. You can share freely my design with the ATM comunity. I have> no idea, if possible to> attach and post something in the atmlist. I joined it this month atmlist and> have not enough experience> with newsgroups and my time free time is very limited.> > best regards> > Ivan> > > ----- Original Message -----> > From: "Ukyo Chen" <ukyochen888@hotmail.com>> > To: "Mel Bartels" <mbartels@bbastrodesigns.com>;> <atm_free@yahoogroups.com>; <make_your_own_telescope@yahoogroups.com>;> <atm@atmlist.net>> > Sent: Wednesday, November 15, 2006 10:02 AM> > Subject: Re: [ATM] [atm_free] Rush into F3.5> >> >> > > Or maybe I can make 2 sets of diagonal for a hyperbolic> mirror+corrector, 1 set with minimize size for visual (10% obstruction),> another set for photograph (18.3% obstruction), and the system is F2.8 if> the mirror is F3.5.> > >> > > The most difficult thing is figuring a hyperbolic mirror...> > >> > > Best Regards,> > > Ukyo Chen> > >> > >> > >> > > > From: mbartels@bbastrodesigns.com> To: atm_free@yahoogroups.com;> make_your_own_telescope@yahoogroups.com; atm@atmlist.net> Date: Tue, 14 Nov> 2006 22:01:56 -0800> Subject: Re: [ATM] [atm_free] Rush into F3.5> > Bottom> line, no.> > > > Mel Bartels> > > > The question is, will I suffer too much> from the coma of a F3.5 system in> visual with 20mm eyepiece?> I do have> wynne corrector plan for photograph, it is ok no matter F3.5 or> F4. So just> care about the coma while observing.> > >> _______________________________________________> ATM mailing list> http://www.atmlist.net/> > > _________________________________________________________________> > > Use Messenger to talk to your IM friends, even those on Yahoo!> > >> http://ideas.live.com/programpage.aspx?versionId=7adb59de-a857-45ba-81cc-685> ee3e858fe> > > _______________________________________________> > > ATM mailing list http://www.atmlist.net/> >
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