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RE: [LX200GPS] Finder Conversion

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  • roy-foreman@tiscali.co.uk
    Hi Bob, Here in the UK the importer for Meade scopes is a place called Telescope House, and it has a subsiduary company called Astro Engineering which
    Message 1 of 12 , Jan 31, 2007
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      Hi Bob,

      Here in the UK the importer for Meade scopes is a place called Telescope
      House, and it has a subsiduary company called Astro Engineering which
      specialises in bespoke accessories for Meade scopes. One of the items they
      sell is a right angle conversion for the LX200 8x50 finder. I have one and
      it is excellent. The kit retains the Meade object lens in its cell and
      provides a shortened tube which just screws on in place of the old one.
      It's 1.25" diagonal has a removable, focussable eyepiece with crosshairs
      which is better quality than the Meade one.

      Their extensive range includes an excellent wedge for the LX200 range and
      matching steel piers.

      Check out their website at www.telescopehouse.co.uk

      Good luck

      Roy


      Original Message:
      -----------------
      From: Klecanda klecanda@...
      Date: Wed, 31 Jan 2007 15:25:26 -0500
      To: LX200GPS@yahoogroups.com
      Subject: [LX200GPS] Finder Conversion


      Hope this doesn't sound too dumb, but is it possible to convert the standard
      Meade 8x50mm finder into a right angle finder? I noticed that the eyepiece
      unscrews and wandered if a Meade 1 14" diagonal could be used as part of the
      conversion.



      Any thoughts?



      Thanks

      Bob



      [Non-text portions of this message have been removed]



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    • john walton
      Dunny is Australian for toilet (from Dung) Pipes range 15mm 22mm 38mm 1.25 and 4 in UK but in OZ they may have different sizes. Many suppliers make ranges of
      Message 2 of 12 , Feb 1 12:10 AM
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        Dunny is Australian for toilet (from Dung)

        Pipes range 15mm 22mm 38mm 1.25" and 4" in UK but in OZ they may have different sizes.
        Many suppliers make ranges of plastic and ABS pipes that may have a suitable size.

        Cheers
        Jonboy
        ----- Original Message -----
        From: Klecanda
        To: LX200GPS@yahoogroups.com
        Sent: Thursday, February 01, 2007 4:52 AM
        Subject: RE: [LX200GPS] Re: Finder Conversion


        Hello Andrew:

        Only have a couple of questions otherwise sounds like a fairly easy project.

        - how do you determine the new length of the tube?

        - more importantly, what's a "dunny" pipe (sorry not familiar with that
        term)?

        Better yet do you have a photo of the finished product?

        Thanks for the help

        Bob Klecanda

        Pickering, Ontario, Canada

        _____

        From: LX200GPS@yahoogroups.com [mailto:LX200GPS@yahoogroups.com] On Behalf
        Of johansea
        Sent: Wednesday, January 31, 2007 9:44 PM
        To: LX200GPS@yahoogroups.com
        Subject: [LX200GPS] Re: Finder Conversion

        Gday Bob

        --- In LX200GPS@yahoogroup <mailto:LX200GPS%40yahoogroups.com> s.com,
        "Klecanda" <klecanda@...> wrote:
        >
        > Hope this doesn't sound too dumb, but is it possible to convert
        > the standard Meade 8x50mm finder into a right angle finder?
        > I noticed that the eyepiece unscrews and wandered if a
        > Meade 1 14" diagonal could be used as part of the
        > conversion.

        You can do it, but you have to cut the tube shorter,
        so its a one way operation.
        I have done this conversion using my old 1-1/4" diagonal,
        but with the extra lightpath length,
        due to the diagonal and replacement EP,
        you cant reach focus unless you shorten the tube.
        I actually made a new tube out of dunny pipe
        rather than cut my existing tube.

        Andrew Johansen Melbourne Australia

        [Non-text portions of this message have been removed]





        [Non-text portions of this message have been removed]
      • johansea
        Gday Bob ... I initially set my objective up on a rough, overly long tube, and kept cutting it down till i could focus with the EPs i wanted to use I did a
        Message 3 of 12 , Feb 1 12:21 AM
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          Gday Bob

          --- In LX200GPS@yahoogroups.com, "Klecanda" <klecanda@...> wrote:
          >
          > Hello Andrew:
          >
          > Only have a couple of questions otherwise sounds like a fairly
          > easy project.
          > - how do you determine the new length of the tube?

          I initially set my objective up on a rough, overly long tube, and kept
          cutting it down till i could focus with the EPs i wanted to use
          I did a rough initial calc by measuring the focal plane distance of
          the XHairs in the original finder, then "roughly" worked out how much
          the diagonal added, then removed that from the tube length.
          Then just kept cutting. Its only a few cents worth of pipe.

          > - more importantly, what's a "dunny" pipe
          > (sorry not familiar with that term)?

          A dunny down here is a toilet.
          Dunny pipe is a colloquial name for PVC pipe used in plumbing
          In this case, 50mm.
          The stuff here has an OD that allows me to thread it for the Meade
          objective cell ( i get 55mmOD x 0.75mm pitch )
          and also has a true 2" id, so i can sleeve it with thinwall alloy pipe
          for a very good axial alignment )

          > Better yet do you have a photo of the finished product?

          Yep
          If you look in my photos album, AJs1, you can see my current
          version with schmicko cheap focusser and my next version.
          The focusser version works well Alt/Az, but fails dismally in polar
          due to slop in the cheap focusser mechanism i used.
          The new version is a thinwall 2"OD aluminium tube sliding inside the PVC
          I have shown it disassembled and assembled.
          For a Meade Objective Cell, and a Meade 1-1/4" diagonal
          with Meade std Plossls, you need approx 115 mm from the back of the
          Objective cell, to the front face of the diagonal.

          So, basically, make the tube about 10 mm too long, and just trim the
          back edge till she focusses. You can then use the std focussing
          mechanism ( ie unscrew the objective cell ) to do fine focussing.

          Andrew Johansen Melbourne Australia
        • John Izzo
          G Day Andrew, I should ve known that it wasn t going to be that easy! :-) One carbonara shld cover it. :-b You re on, when? It would be good; it has been a
          Message 4 of 12 , Feb 1 1:42 AM
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            G'Day Andrew,



            I should've known that it wasn't going to be that easy! :-)



            "One carbonara shld cover it. :-b"

            You're on, when? It would be good; it has been a long time since..

            Name the day.



            Cheers



            John



            Stella Observatory

            Macedon Vic

            Australia





            [Non-text portions of this message have been removed]
          • Klecanda
            Hello again Andrew: Thanks for all the information. Checked out your photos and found them very helpful. Let the conversion begin!!! Clear skies Bob P.S.
            Message 5 of 12 , Feb 1 5:08 PM
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              Hello again Andrew:



              Thanks for all the information. Checked out your photos and found them very
              helpful.

              Let the conversion begin!!!



              Clear skies

              Bob



              P.S. Thanks also to everyone else for their input.



              _____

              From: LX200GPS@yahoogroups.com [mailto:LX200GPS@yahoogroups.com] On Behalf
              Of johansea
              Sent: Thursday, February 01, 2007 3:21 AM
              To: LX200GPS@yahoogroups.com
              Subject: [LX200GPS] Re: Finder Conversion



              Gday Bob

              --- In LX200GPS@yahoogroup <mailto:LX200GPS%40yahoogroups.com> s.com,
              "Klecanda" <klecanda@...> wrote:
              >
              > Hello Andrew:
              >
              > Only have a couple of questions otherwise sounds like a fairly
              > easy project.
              > - how do you determine the new length of the tube?

              I initially set my objective up on a rough, overly long tube, and kept
              cutting it down till i could focus with the EPs i wanted to use
              I did a rough initial calc by measuring the focal plane distance of
              the XHairs in the original finder, then "roughly" worked out how much
              the diagonal added, then removed that from the tube length.
              Then just kept cutting. Its only a few cents worth of pipe.

              > - more importantly, what's a "dunny" pipe
              > (sorry not familiar with that term)?

              A dunny down here is a toilet.
              Dunny pipe is a colloquial name for PVC pipe used in plumbing
              In this case, 50mm.
              The stuff here has an OD that allows me to thread it for the Meade
              objective cell ( i get 55mmOD x 0.75mm pitch )
              and also has a true 2" id, so i can sleeve it with thinwall alloy pipe
              for a very good axial alignment )

              > Better yet do you have a photo of the finished product?

              Yep
              If you look in my photos album, AJs1, you can see my current
              version with schmicko cheap focusser and my next version.
              The focusser version works well Alt/Az, but fails dismally in polar
              due to slop in the cheap focusser mechanism i used.
              The new version is a thinwall 2"OD aluminium tube sliding inside the PVC
              I have shown it disassembled and assembled.
              For a Meade Objective Cell, and a Meade 1-1/4" diagonal
              with Meade std Plossls, you need approx 115 mm from the back of the
              Objective cell, to the front face of the diagonal.

              So, basically, make the tube about 10 mm too long, and just trim the
              back edge till she focusses. You can then use the std focussing
              mechanism ( ie unscrew the objective cell ) to do fine focussing.

              Andrew Johansen Melbourne Australia





              [Non-text portions of this message have been removed]
            • Thad Floryan
              ... SPeaking of which -- another great use for such pipe is as an extended dew shield for finders, even some of the red-dot finders. SUch pipes are typically
              Message 6 of 12 , Feb 1 9:14 PM
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                --- In LX200GPS@yahoogroups.com, "john walton" <johnvwalton@...> wrote:
                >
                > Dunny is Australian for toilet (from Dung)
                >
                > Pipes range 15mm 22mm 38mm 1.25" and 4" in UK but in OZ they may have
                > different sizes.
                > Many suppliers make ranges of plastic and ABS pipes that may have a
                > suitable size.

                SPeaking of which --

                another great use for such pipe is as an extended dew shield for
                finders, even some of the red-dot finders. SUch pipes are typically
                PVC or ABS and can be carved to make them fit if necessary.

                One tip with such pipes: roughen the inside with sandpaper and spray
                paint with flat black. Wait a few days for all the stuff to outgas
                and it'll work perfectly and safely.
              • johansea
                Gday Thad ... And also compression rings. For the new finder i am using, i used some high pressure PVC pipe. Right dia and thickness. Just cut it and spring
                Message 7 of 12 , Feb 2 12:05 PM
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                  Gday Thad

                  --- In LX200GPS@yahoogroups.com, "Thad Floryan" <thad@...> wrote:
                  >
                  > > Many suppliers make ranges of plastic and ABS pipes that
                  > > may have a suitable size.
                  >
                  > SPeaking of which --
                  >
                  > another great use for such pipe is as an extended dew shield for
                  > finders,

                  And also compression rings.
                  For the "new" finder i am using, i used some high pressure PVC pipe.
                  Right dia and thickness. Just cut it and spring into position.
                  Grips well and preserves the barrels of my EPs when i use the finder
                  as a "straight through"

                  Andrew Johansen Melbourne Australia
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