Re: [APML] Photographic test of Meade 8" f/4 Schmidt-Newton

["MNewton" <mnewton1@bellsouth.net>]

Chris, this Meade 622, was it the f3.6 schmidt-newt? I have just bought one,
it has a boat-load of astigmatism

----- Original Message -----
From: "Chris Schur" <cschur@cybertrails.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, May 26, 2003 11:25 PM
Subject: Re: [APML] Photographic test of Meade 8" f/4 Schmidt-Newton


> Walter, You are obtaning similiar results that I got with my Meade 622,
the
> predecessor of the latest series of schmidt newtonians.  I believe that
> while it is usable as a film camera, it really shines as a CCD instrument,
> the center of the field being bright and exposures are quite short.
>
> Thanks for sharing.
>
> Chris
> Astrophotograpy site: http://www.PSIAZ.com/schur/astro/index.html
>
> ----- Original Message -----
> From: Walter Koprolin <a9125657@unet.univie.ac.at>
> To: <astro-photo@seds.org>
> Sent: Friday, May 23, 2003 5:15 AM
> Subject: [APML] Photographic test of Meade 8" f/4 Schmidt-Newton
>
>
> > Hi everybody!
> >
> > This might be of interest to the group:
> >
> > I recently had the opportunity to shoot two 35mm astrophotos with a
Meade
> > 8" f/4 Schmidt-Newton. I have written a short test report about it:
> >
> > http://www.astro.univie.ac.at/~koprolin/Art/SN8/
> >
> > As you can see, the telescope is problematic in astrophotographic use.
The
> > images suffer from vignetting and distorted stars near the edges. If
> > bright stars are present near or within the photographed field, multiple
> > reflections and Schmidt ghosts also become a major hassle.
> >
> > All these artifacts except the radial distortion of stars can be
> > eliminated or nearly eliminated during image processing, but some of
them
> > only with considerable effort.
> >
> >   Walter Koprolin
> >   Gallery of Astrophotography & CCD, Observation Reports,
> >   Telescope Testing: http://www.astro.univie.ac.at/~koprolin
> >
> >
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>
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