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Re: Dimmer images on SCT

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  • rckrchrdsn@yahoo.com
    I would suggest some Bob s knobs. You don t need a screw driver or allen wrench. Much easier in the dark. My Meade LX200 holds collimation with the nylon
    Message 1 of 13 , Sep 30, 2001
      I would suggest some Bob's knobs. You don't need a screw driver or
      allen wrench. Much easier in the dark. My Meade LX200 holds
      collimation with the nylon bolts just fine.

      --- In sct-user@y..., Ron Fleming <ronflemingvideo@y...> wrote:
      >
      > --- Phil Chambers <ptchamb@s...> wrote:
      > > Hi Ron:
      > > Have you checked the collimation. 19mm is a "sweet
      > > spot" for an f10
      > > scope with a 2mm exit pupil (OK, OK, 20mm is
      > > correct). This should give
      > > very sharp views.
      > >
      > > Greg correctly points out the difference between
      > > focal lengths and the
      > > effect of the same ep in different focal length
      > > scopes, but a problem with
      > > 19mm shouldnt occur.
      > >
      > Thanks for your response Phil.
      >
      > The telescope looks ok on collimation after a rough
      > check, but I have not yet done a fine collimation
      > check.
      >
      > When the skies around here (Orlando) clear, I'll take
      > a closer look.
      >
      > Hopefully fine collimation will sort this out. But
      > I've still got to develop the guts to go at the
      > secondary with a philips head!
      >
      > Thanks for helping to sort this out.
      >
      > Clear skies.
      >
      > P.S. - This scope is beyond belief in terms of light
      > gathering and image clarity at low to mid power! I'm
      > very happy with it.
      >
      >
      > > There is a reduction in observed light as your pupil
      > > can open to 5mm on
      > > the average. 7mm for the young and the occasional
      > > person. But it
      > > shouldnt be dramatic.
      > >
      > > There is not much one can do about seeing conditions
      > > which limits how much
      > > mag one can use. On occasion, views to 4 or 500
      > > should be possible but
      > > the air has to be steady. Lack of focus at high
      > > power can be collimation
      > > but more likely seeing. SCTs are -notoriously-
      > > sensitive to collimation
      > > and it should be done at a much higher power than
      > > you are going to be
      > > using for observing. This is especially true for
      > > planets and moon detail.
      > > On FFOs (faint fuzzy objects) you probably wont
      > > notice a slight out of
      > > coll issue.
      > >
      > > ---------
      > > Phil Chambers [ptchamb@s...] (S.F. Bay Area -
      > > Calif. USA)
      > >
      > >
      > > On Fri, 28 Sep 2001, Ron Fleming wrote:
      > >
      > > >
      > > > --- RMOLLISE@a... wrote:
      > > > > Hello Gang:
      > > > >
      > > > > FYI from Frank at Astrotec...
      > > > >
      > > > >
      > > >
      > >
      > ========================================================
      > > > >
      > > > >
      > > > > Hi Rod,
      > > > > I just placed an ad on Astronomy-mall (09/28/01
      > > > > 12:30AM EDT) for a Nexstar
      > > > > 11 GPS Carbon Fiber Tube Telescope at 2999.00.
      > > This
      > > > > scope is in stock and
      > > > > available to the first person who wants it. I
      > > wanted
      > > > > to give the list a
      > > > > heads up on it. If you would like to post this
      > > > > please feel free. I just
      > > > > don't want to risk starting any discussion about
      > > > > posting an ad to the group.
      > > > >
      > > > > Thanks,
      > > > > Frank at "Astrotec"
      > > > > Telescopes, Accessories and Binoculars Tel.
      > > > > 631-563-9009
      > > > > http://www.astrotecs.com
      > > > > astrotec@a...
      > > > >
      > > > >
      > > > >
      > > > > [Non-text portions of this message have been
      > > > > removed]
      > > > >
      > > > >
      > > > I've got a problem which might be natural to this
      > > > SCT's.
      > > >
      > > > I am a previous owner of Refractor telescopes. I
      > > > recently purchased a Celestron C11.
      > > >
      > > > Images using wide angle eyepieces are fine.
      > > However,
      > > > when I go down to 19mm or below, especially with a
      > > > 10mm or less, I find the images will not focus.
      > > > Indeed they dim quite of bit.
      > > >
      > > > Is anyone familiar with this? Is it possible to
      > > > correct the problem?
      > > >
      > > > Thanks for reading this message.
      > > >
      > > > Clear skies.
      > > >
      > > > __________________________________________________
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      > > phone.
      > > > http://phone.yahoo.com
      > > >
      > > >
      > > > Visit the sct-user home page at:
      > > >
      > > >
      > > >
      > > > http://members.aol.com/RMOLLISE/index4.html
      > > >
      > > > Your use of Yahoo! Groups is subject to
      > > http://docs.yahoo.com/info/terms/
      > > >
      > > >
      > > >
      > >
      > >
      >
      >
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