Re: Mod to scope
From: Chris L Peterson (clp_at_alumni.caltech.edu)
Date: 08/18/04
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Date: Wed, 18 Aug 2004 06:22:51 GMT
On Tue, 17 Aug 2004 23:13:54 -0700, "starlord" <starlord@despammed.com> wrote:
>I have not put anything to paper yet, so I figured I'd ask here for any
>ideas.
>
>I have a Stargazer Steve Dob ( f9 4.25inch ), the scope has the EP at the
>top 12:00 point on the tube, for most of the younger folks this is not bad,
>but at times, when I'm sitting on a chair, it is hard to use. So I am
>thinking that I'd like to do a mod to the scope, but not sure how to do it
>yet.
>
>What I want to do is cut the tube at about the 1/2 point and make it so I
>can rotate the top section so I can view from the side points ( 10, 2
>points.)
I have a JMI Newt with a rotating cage, and it's a bitch to collimate. That is,
in order for the collimation to remain perfect with rotation, you really have to
make sure everything is aligned. So whatever method you use, make sure that it
keeps both tube segments perfectly aligned and doesn't allow any sag. Also, make
sure you have enough degrees of freedom in your spider to really do a proper
collimation. Things like having the mirror a little uncentered, which are
normally harmless (because you can compensate with the angle of the mirror) will
kill you when you have a rotating tube.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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