[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [ATM] 8" f/3.5 !

To: "Thomas Janstrom" <atm@atmlist.net>
Subject: Re: [ATM] 8" f/3.5 !
From: Richard <cnc@cncservo.co.uk>
Date: Mon, 15 Jan 2007 00:58:09 +0000
Delivered-to: atm_arc@astro.umsystem.edu
In-reply-to: <019701c7383a$474d10c0$0501a8c0@Mylaptop>
List-archive: <http://www.atmlist.net/pipermail/atm>
List-help: <mailto:atm-request@atmlist.net?subject=help>
List-id: The Amateur Telescope Makers List <atm.atmlist.net>
List-post: <mailto:atm@atmlist.net>
List-subscribe: <http://www.atmlist.net/mailman/listinfo.cgi/atm>, <mailto:atm-request@atmlist.net?subject=subscribe>
List-unsubscribe: <http://www.atmlist.net/mailman/listinfo.cgi/atm>, <mailto:atm-request@atmlist.net?subject=unsubscribe>
References: <45aac338.2245.0@bestweb.net> <019701c7383a$474d10c0$0501a8c0@Mylaptop>
Reply-to: Richard <cnc@cncservo.co.uk>
Sender: atm-bounces@atmlist.net

Hi Thomas,

Monday, January 15, 2007, 12:15:31 AM, you wrote:

TJ> BTW If you're not keen on figuring such a steep curve, you could leave it
TJ> spherical and make an ellipsoidal secondary such as found in a
TJ> Richie-Cretian Cassigrainian..... A bit harder to do, but not a bad scope as
TJ> things go if you keep the system F ratio in the teens, this goes for the DK
TJ> too. 

Not sure which configuration has a spherical primary and ellipsoidal
secondary Tom, but it's not Cass, RC or DK .

Cass : Pri P, Sec H
RC   : Pri H, Sec H
DK   : Pri E, Sec S


-- 

Best regards,
  Richard in the UK

_______________________________________________
ATM mailing list http://www.atmlist.net/

References:
- [ATM] 8" f/3.5 !
  - From: "Francis J. O'Reilly" <foreilly@bestweb.net>
- Re: [ATM] 8" f/3.5 !
  - From: "Thomas Janstrom" <thomas@moiler.com>

Prev by Author: Re: [ATM] slurry pump
Next by Author: Re: [ATM] slurry pump
Previous by thread: Re: [ATM] 8" f/3.5 !
Next by thread: Re: [ATM] 8" f/3.5 !
Index(es):
- Author
- Thread