Re: [APML] 9mm or 12mm guiding eyepiece

["Ray Kilburn" <AuroraCEA@earthlink.net>]

The 12 mm is an MA eyepiece and the 9mm is a Super Plossl.  The Plossl is
superior in resolution and contrast.  The circles with the cross hairs is
just a bullseye serves no other purpose..  The 9mm crosshairs are also
adjustable within the FOV making alignment with a guidestar easier.  The 12
mm is not adjustable.

*****************************************
Ray Kilburn
Culpeper, VA
USA
----- Original Message -----
From: "Woolies Woolies" <astrolist@hotmail.com>
To: <astro-photo@seds.org>
Sent: Monday, August 20, 2001 3:12 PM
Subject: Re: [APML] 9mm or 12mm guiding eyepiece


> Dear Matt,
>
> Thank you for all your information.
> My telescope is an 8" f/5 F1000mm Newtonian. It has a steady EQ mount with
> dual axis motor drive with Hand Controller.
> I have read "Astrophotography for the Amateur" by Covington, I have the
> book.
> How am I suppose to do much piggy back when I do not have a guiding
> eyepiece....yet!
> If I get a guidescope I will mount it on the top of my telescope with
> guidescope rings. My both tube rings have the ability to add a guidescope.
>
> My question here is for the guiding eyepiece. Should I go for the 9mm with
> double crossline and two concentric circles or the 12mm with double
> crossline and without the concentric circles. What are the
> concentric circles for? When do you use them?
>
> Thanx again for your help.
>
> Marios.
> http://www.cyprusastronomy.com
>
>
>
> >From: Matt BenDaniel <matt@starmatt.com>
> >Reply-To: astro-photo@seds.org
> >To: astro-photo@seds.org
> >Subject: Re: [APML] 9mm or 12mm guiding eyepiece
> >Date: Mon, 20 Aug 2001 14:26:27 -0400
> >
> >Marios,
> >
> >It depends to some extent what type of telescope you have. For some
scopes
> >(e.g.
> >SCTs) an OAG is the best method. For a refractor, I much prefer using a
> >guide
> >scope. With a guide scope it is easy to find a guide star and to manually
> >guide
> >on it.
> >
> >With an OAG, you may find you have to tilt your head at a very weird
angle
> >to
> >see through the guide port. To do that for any length of time will be
> >tedious at
> >best and damaging to your neck at worst.
> >
> >What type of telescope do you have?
> >What type of mount do you have? Does it have a dual motor hand control?
> >Do you have a plan to mount a guide scope?
> >Have you done much piggyback photography yet?
> >Have you read "Astrophotography for the Amateur" by Covington?
> >
> >Matt BenDaniel
> >http://starmatt.com
> >
> >Woolies Woolies wrote:
> >
> > > Thank you all for your information.
> > > I have to tell you that I have never guided before and I will be
guiding
> > > manually. I do not have an autoguider. I might consider that in the
> >future.
> > > Or I might go for an off-axis guider.
> > > What do you recomment?
> > >
> > > Thanx again.
> > > Marios.
> > > http://www.cyprusastronomy.com
> >
> >
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>
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