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

[Ukyo Chen <ukyochen888@hotmail.com>]

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/
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