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RE: [ccd-newastro] Re: M20

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  • Ron Wodaski
    Looks more like a collimation issue. However, poor collimation is exacerbated by a reducer, especially one that is out of position, so it could be both
    Message 1 of 26 , Jul 31, 2002
    • 0 Attachment
      Looks more like a collimation issue. However, poor collimation is
      exacerbated by a reducer, especially one that is out of position, so it
      could be both interacting.

      Ron Wodaski
      author of The New CCD Astronomy
      http://www.newastro.com


      -----Original Message-----
      From: carlburton2001 [mailto:carlburton2001@...]
      Sent: Wednesday, July 31, 2002 12:13 PM
      To: ccd-newastro@yahoogroups.com
      Subject: [ccd-newastro] Re: M20


      Ron-
      I put in in the files section at http://groups.yahoo.com/group/ccd-
      newastro/files/M20-try1%20copy.jpg . I'll try and move the reducer
      closer to the chip tonight and see what happens.

      Carl

      --- In ccd-newastro@y..., "Ron Wodaski" <ronw@n...> wrote:
      > Attachments aren't permitted in the group to avoid the risk of
      viruses. Can
      > you point me to a location on the web where I could get a look at
      the file?
      > If you don't have a web site, you can upload a JPG image to the
      group's
      > FILES section.
      >
      > A generic point about reducers:
      >
      > * Reducers have to be located a certain distance from the camera's
      chip in
      > order to work effectively. If they are not at this distance, they
      will
      > introduce various aberrations. The faster the reducer, the more
      critical the
      > distance is. Ted Agos makes an adapter for the f/6.3 reducer that
      helps
      > maintain this distance when working with motorized focusers.
      >
      > Ron Wodaski
      > author of The New CCD Astronomy
      > http://www.newastro.com
      >
      >
      > -----Original Message-----
      > From: carlburton2001 [mailto:carlburton2001@y...]
      > Sent: Wednesday, July 31, 2002 6:38 AM
      > To: ccd-newastro@y...
      > Subject: [ccd-newastro] M20
      >
      >
      > Hi Ron-
      > I took this image of M20 last night. I have been using a f6.3
      > reducer with my Van Slyke focuser giving a f-ratio of 4.6. I see
      > stars in a circular patern, is this caused by the reducer,
      > collimation, or me?
      >
      > The image was made up from 6x300 sec RG 9x300 sec B and the L
      > channel was of the RGB with a ST-8e.
      >
      > Any other sugggestion on the image?
      >
      > Thanks
      >
      > Carl Burton
      >
      >
      >
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