Re: [ATM] steel tubing for mirror cell

["Stuart Hutchins" <stuart452@earthlink.net>]

William,

That works on my 8" f/8 Newtonian mounted on equatorial fork.  The "fixed"
pivot can be adjusted at the bottom of the tube when the scope is assembled.
For collimation, I point the scope at zenith in the twilight, stand on the
north side looking in a collimating eypiece, and collimate by turning two
knobs, one under my left hand, one under my right.  Turn them both the same
direction and the mirror tilts along the meridian line N-S.  Turn them
opposing directions and the mirror tilts along a line of right ascension,
E-W.  I collimate the scope in about 20 seconds before every observing
session this way.

Stuart Hutchins

----- Original Message ----- 
From: "William Chang" <williamichang@yahoo.com>
To: <atm@atmlist.net>
Sent: Sunday, February 27, 2005 9:02 PM
Subject: Re: [ATM] steel tubing for mirror cell


>I agree with both of you :-) and can suggest a reverse-Highe design
> where the triangle is on the outside, the pivoting "bars" on the inside
> of the triangle.  This way the triangle more easily reaches beyond the
> mirror for top-down collimation.  Also, I was thinking one tip of the
> triangle might "bolt" into the side of the mirror box, while the two
> lower tips of the triangle collimate parallel to scope axis.  Any
> reason that wouldn't work?  -- William (Saratoga, CA)
>



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