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71517Re: Starshoot /Focal Reducer

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  • Bob
    Aug 1, 2012
      Bob,
      Thanks for the info and I am looking into the various programs available for my Mac. Will post some pictures when I have something to show. When the rain clears.

      Regards Bob
      Devon

      --- In ccd-newastro@yahoogroups.com, "Bob Franke" <bfranke@...> wrote:
      >
      > Hello Bob,
      >
      > The Moon is about 1920" in diameter. This means you need an image scale of 2.0 arcSec/pixel to exactly fit the Moon on the chip. So I would go for about 2.25. To get this image scale you need to get your focal length down to about 325mm.
      >
      > This large reduction is not at all practical or for than matter even possible. I suggest you concentrate on close-up views of interesting craters. For a wider FOV start experimenting with mosaics.
      >
      > Hope this helps,
      > Bob
      > http://bf-astro.com
      >
      >
      > --- In ccd-newastro@yahoogroups.com, "Bob" <bobden72@> wrote:
      > >
      > > Hi all I am new to this group and am getting into astro imagery. I have had a Meade ETX105 Maksutov - Cassegrain telescope, for about ten years. I have recently bought a Orion Starshoot colour imaging camera. I have taken some pictures of the Moon and Saturn so far. The field of view is rather small to take a picture of the whole Moon. So I need a focal reducer,I have bought one which is x.5 but still can only see part of the moon. The question is what size would you recommend so I can see the whole of the Moon. The scope diameter 105mm focal length 1470mm (F14). The imager sensor size 1/3", number of pixels 1280 x 960 and pixel size 3.6um x 3.6um.
      > >
      > > Regards Bob
      > >
      >
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