Re: [APML] Guidescope questions

["Jim Ives" <flyboy9990@earthlink.net>]

I see your guiding with a Mak. Have you encountered any problems with mirror
shift in your guide scope?
Jim
----- Original Message -----
From: "Jeff Crilly" <jlcphoto@myrealbox.com>
To: <astro-photo@seds.org>
Sent: Wednesday, October 16, 2002 9:28 PM
Subject: Re: [APML] Guidescope questions


>
>
>
> > Jeff thats a neet scope! Did you build it?
>
> Yes i did.  thanks for the comment.
>
> Ok.. slightly off topic, but I have to brag...
>
> I cant take all the credit.  The design comes
> from a combination of .... "A scope like Alice" (a two
> pole design http://www.astronomydaily.com/atm/alice.asp),
> the bartels lightweight design, and mostly Albert Highe's
> most excellent lightweight scopes....
> http://pw2.netcom.com/~ahighe/12_5ultra.html
>
> The notable bits are... hacksaw seconday spider (ala..
> http://www.atmsite.org/contrib/Carlin/spider/ though
> mine is a bit different).... the secondary "cage" is
> movable on the three struts to adust the focal plane...
> This was essential to getting the focal plane far enough
> out for the 35mm camera.  (I guess I could have measured
> everything, but this allows for adjustment.)  ... The primary
> is from an orion 8" dob.
>
> Btw, that three vane spider produces interesting diffraction effects
> on the images - two of the spikes are longer than the other
> spikes -- i.e. the spikes generated by the "half vane" are
> shorter.  See http://www.fototime.com/93ACA2A19FDDADF/standard.jpg
> for an example of this.  I like this... its unique.
>
> This scope was built in about two frantic weeks of evenings
> and couple weekends prior to the october new moon
> for film imaging at calstar 2002.  The parts/wood were mostly
> found in the garage, but I did make many many trips to the
> hardware store for bolts/nuts/screws/drill-bits/etc.
>
> The guidescope mounting was totally last minute and needs
> major improvement (next project).
>
> Here's a couple more photos of it.. higher rez...
> http://pages.sbcglobal.net/jlc/new8inch-a.jpeg
> http://pages.sbcglobal.net/jlc/new8inch.jpeg
>
> Its still a work in progress.. it needs stain/urethane and
> some blackout paint, and a dob mount for easy visual use
> when not taking photos, guidescope mounting, and the
> losmandy dovetail balance is about two inches off requiring weight
> on the primary end.
>
> jeff
>
>
>
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