Re: [APML] STV Questions

["Jim Janusz" <jjanusz@dc.rr.com>]

Hi Shekhar,

I have been using the eFinder to guide my 180EDF and 4x5 camera using TP.
It has been my experience that at 1260mm fl the eFinder will guide without
trailing for about 90 minutes.  Now I'm not certain what causes the
trailing, it could be ring flexure or other things.  I would expect that you
could go longer with the shorter fl and no other flexure problems.

I have the ST-V attached to a Losmandy dovetail bracket and dovetail plate
attached to the top of my main tube rings.

You can see shots taken with this setup on my Web Page in the 180 section.

http://www.astroimager.net/

Jim

----- Original Message -----
From: "Shekhar Borde" <shekhar@prodigy.net>
To: "APML" <astro-photo@seds.org>
Sent: Friday, March 29, 2002 2:41 PM
Subject: [APML] STV Questions


> All,
>
> Does anyone know what, if any, differential flexure issues might arise
> using an STV with an e-finder.  Is it completely immune to flexure or
> only less so?  How does one mount the STV with e-finder on top of
> the main scope?
>
> Given my setup, an 800mm FL scope on a G-11, what would be the
> longest exposure I could do using an STV+efinder combination?
>
> I have been wanting to try H-alpha filtered shots on Tech Pan but
> only if I can go 2 to 3 hours.  This is practically impossible with my
> current ST-4 + guidescope setup.  I am wondering if the STV will
> solve this problem.  Using an OAG is not an option with my Vixen
> R200SS scope.
>
> Thanks,
>
> Shekhar
>
>
>
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