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

["Woolies Woolies" <astrolist@hotmail.com>]

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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