Re: [ATM] equatorial platform and best scope for uses

[Jarvis Krumbein <jkoptic@juno.com>]

Kevin, a good compromise is to use a good, preferably APO type, 2X Barlow
lens.  This will give you one scope useable for both general use and for
planetary use.  A better focal ratio would be around f7 though for the
mirror.

Jarvis Krumbein

On Fri, 30 Sep 2005 09:15:51 -0400 "Kevin Williams"
<kwilliams6176@verizon.net> writes:
> I have built my own scope (6" dobsonian mount newtonian), and have 
> taken
> pictures of the moon
> 
> My next step is an equatorial platform
> 
> I have been reading everything I can find on the web, I don't want a
> computer controlled scope, but one that will track what I point it 
> at
> 
> I specifically want to use it with a webcam, for plane, moon and 
> deep sky (I
> know its small but have to start somewhere)
> 
> I am leaning toward a design like
> http://home.wanadoo.nl/jhm.vangastel/Astronomy/Poncet/e_index.htm
> 
> I think I could probably build this based on the instructions given, 
> with
> some changes, not improvements, but changes based on material on 
> hand, and
> material available
> 
> any comments, advice would be appreciated
> 
> second question
> 
> I am currently making an 8" f5 mirror for a general use scope, but . 
> .
> 
> if I wanted one scope for planetary observation, and one scope for 
> deep sky,
> what size f/ratio is best for each
> 
> I only limiting factor is I want my next mirror to be 12 inch, and 
> after
> that maybe 14-16 inch
> 
> I would like for 1 to planetary and one deepsky, and they would both 
> be used
> for webcams
> 
> thanks for any advice on this
> 
> Kevin
> 
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> 

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