[APML] Coma Corrector for 10" f/4.72 Newton

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

Hi everybody,

I am in search for a decent coma corrector for a 10" f/4.72 Newt which
will be dedicated for 35mm astrophotography. Searching the web and the
APML archive, I came across several 2" models like the TeleVue Paracorr or
the Baader/Celestron coma corrector, which introduce unwanted vignetting
and/or a Barlow effect, i.e. a longer focal length, which is also not what
I want.

The Vixen coma corrector is larger (does anyone know the free aperture and
outside diameter?), I read, and takes a special direct-wide photo adaptor,
but will it work for my f/4.72 system? It is built for the R200SS, which
is f/4. I also came across a Lumicon model, but found no additional data
on that one.

I am looking for pin-point stars and no vignetting out to the edges of
35mm format. Any ideas?

Thanks in advance for your help,

  Walter Koprolin
  Astrophoto-Gallery, Observation Reports, Telescope Testing:
  http://www.astro.univie.ac.at/~koprolin/

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