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

[Walter Koprolin <a9125657@unet.univie.ac.at>]

Hi Chris!

Nice CCD image! I think the sample I tested would also have performed well
with a small CCD, at least if you don't shoot near bright stars where
reflections etc. get annoying.

The elongated stars at the center of my Horsehead Nebula picture are most
probably due to a guiding error in declination, with perfect guiding the
performance there should be ok.

Yours sincerely,

  Walter Koprolin
  Gallery of Astrophotography & CCD, Observation Reports,
  Telescope Testing: http://www.astro.univie.ac.at/~koprolin


On Tue, 27 May 2003, Chris Schur wrote:

> Walter, sounds like there is quite a variation in the optics here.  mine is
> sharp on 35mm up to about the 80 percent zone, then the coma is the dominant
> factor.  With small CCD, I got this image:
>
> http://www.psiaz.com/schur/astro/IMAGES/ccd/m17-5mblend-1.jpg
>
> Chris Schur
> ----- Original Message -----
> From: MNewton <mnewton1@bellsouth.net>
> To: Discussion of Film Astrophotography <astro-photo@seds.org>
> Sent: Monday, May 26, 2003 10:32 PM
> Subject: Re: [APML] Photographic test of Meade 8" f/4 Schmidt-Newton
>
>
> > 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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