Re: [ATM] 40" mirror

["matt" <mariusrf@bellsouth.net>]

Hi Jerry,

It's a trade off as most engineering decisions. If you make a folded
newtonian the scope will be shorter and the mechanical problems with the
long truss poles will be reduced. A shorter scope can hold its shape better
with less sag. It has less windage and if you use a Nasmyth focus it's much
easier to use than climbing a ladder . The drawback is one extra mirror but
you could buy that since it's a small flat , and the collimation procedure
would have one or more extra steps .

best regards,
matt tudor


-----Original Message-----
From: Jerry B. Hillman <JBHillman@ev1.net>
To: matt <mariusrf@bellsouth.net>
Cc: 'The Amateur Telescope Makers List' <atm@atmlist.net>
Date: Sunday, December 26, 2004 7:34 AM
Subject: Re: [ATM] 40" mirror


>Hi Matt,
>I am looking into Cas, coude, etc. designs, but haven't learned enough
about
>them to make a decision to go that route. This is only my third mirror.
>Succeeding on the simplest terms, ie. a Dob/Newt is probably going to be a
>challenge as it is without trying the exotic designs.
>
>Clear skies,
>Jerry
>
>

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