Re: ATM Re: Minimalist dobs.

["at making" <atmaking@hotmail.com>]

Hi,

Same for me, a very intresting thing could indeed have large very light 
secondary, a must for big dob.
if we got the opportunity one day to have those big lightweight miror, I 
think the whole design of dobs will change. A great opportunity to 
experiment new designs ! The mirror will be the only thing to be light, most 
of the structure include the sell will also change in weight.

Something I wonder, I have used not long ago a full composite dob. The 
experience was not very good in my opinion because a minimal weight help to 
"feel" the scope while moving it by hand. With tracking, things are not the 
same of course.

Frédéric Géa
http://astrosurf.com/altaz/index_e.htm

>From: Clive Milne <milnecd@yahoo.com>
>Reply-To: Clive Milne <milnecd@yahoo.com>
>To: atm@shore.net
>Subject: ATM Re: Minimalist dobs.
>Date: Thu, 31 Jul 2003 16:17:59 -0700 (PDT)
>
>
>  "Shane LaPierre"  wrote:
><snip>Carbon fiber mirrors
> >and 1/2 meter telescopes that weight in at 45 lbs total.
> >If I can continue  the dream it will cost around $1000 usd.
>
>      I'm not sure that carbon fibre primary mirrors will serve that
>much purpose in a conventional dobsonian as the centre of gravity will
>shift to an inconvenient location.  I see carbon fibre secondaries
>as being an interesting option for the opposite reason.
>
>  ~Clive.
>
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