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19105[William Optics] Re: Linear Focuser

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  • aruangra
    Dec 9, 2008
      Hi Sander:

      The drawtube end is not threaded. It is tapered with the dimensions as
      shown in photos (ID = 50mm, OD = about 55mm).

      Regards,
      Anat


      --- In William-Optics@yahoogroups.com, Sander Pool <sander@...> wrote:
      >
      >
      > Thanks for these photos. Looks like a gorgeous focuser. Did you find
      out
      > the thread size that holds the 2" compression fitting? I've considered
      > removing mine but with the second set screw I've eliminated flexure
      > there so I've shelved it for now.
      >
      > Sander
      >
      > aruangra wrote:
      > >
      > > I uploaded some photos in this folder:
      > >
      http://groups.yahoo.com/group/William-Optics/photos/album/1438929508/pic/list

      > >
      <http://groups.yahoo.com/group/William-Optics/photos/album/1438929508/pic/list>
      > > and show some dimensions.
      > >
      > > My initial evaluations:
      > > 1) The focuser is a 2" focuser, not a 2.5" focuser.
      > > 2) The two setscrews on the top are not used. You can see that they
      > > are not extended to the drawtube.
      > > 3) Three plastic setscrews are used to hold the focuser assembly to
      > > the OTA and three plastic setscrews are used to hold the 2" adapter to
      > > the drawtube. I think it is not secured to use plastic setscrews. I
      > > understand that they are used to prevent scratches but the strength is
      > > more important than cosmetic issues in this case. I will replace them
      > > with stainless steel setscrews.
      > >
      > > This focuser is a BIG improvement for AP because:
      > > 1) the drawtube can be locked.
      > > 2) the microfocuser is very SMOOTH.
      > > 3) the 2" adapter can be removed. So a ccd camera can be fixed rigidly
      > > to the drawtube by a custom-made adapter.
      > >
      > > Regards,
      > > Anat
      > >
      > > -
      > >
      >
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