Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Simple focus adapter to convert vintage scopes into modern 1.25inch eyepiece carriers

  • Please log in to reply
20 replies to this topic

#1 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 31 October 2018 - 10:06 AM

The Skywatcher 2x Barlow body fits conformally into my Swift 639 and Carton Focuser .

It should not be taken in and out on a whim  as it may damage the threads over time but its quite solid and concentric.

Note : 

It does not work on the smaller diameter 60mm / 700mm Tasco like focusers 

Attached Thumbnails

  • post-260556-0-09728500-1539368719_thumb.jpg

  • Jon Isaacs likes this

#2 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 31 October 2018 - 10:33 AM

Very concentric and snug.

Attached Thumbnails

  • 45137002_2778257448867052_997422406928695296_o.jpg


#3 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 31 October 2018 - 10:36 AM

Tele Vue diagonal fitting vintage Carton Focuser 

Attached Thumbnails

  • 45259801_2778225865536877_25416920673026048_o.jpg


#4 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 31 October 2018 - 10:41 AM

Notice : the black part of the body showing 2x fits inside , only the outer rim remains outside for adaption to diagonal .

Also obviously the Barlow lens itself is taken out.

Attached Thumbnails

  • Sky-Watcher-2x-Barlow-Lens-for-Telescopes_800x.jpg


#5 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 31 October 2018 - 10:45 AM

Other cheap Barlow lens types on hand  from Meade and others  do not fit precisely .

Only Skywatcher to my knowledge but I had only 3 types to choose  from so.....

Try it ( with caution) and see.



#6 terraclarke

terraclarke

    Hubble

  • *****
  • Posts: 17950
  • Joined: 29 May 2012
  • Loc: Third from the Sun

Posted 31 October 2018 - 11:35 AM

The standard Vixen Optics EA 36.4mm to 31.7mm (part # 3720) 1.25" adapter should thread right in, fit perfectly, and look like it was made for it rather than a cobbled up mess.

 

https://www.bhphotov...UQAvD_BwE&smp=y



#7 Sequimite

Sequimite

    Mariner 2

  • *****
  • Posts: 208
  • Joined: 22 Aug 2008
  • Loc: Sequim, WA

Posted 31 October 2018 - 11:40 AM

I can testify that this Vixen adapter worked perfectly on my Bushnell Sky Chief II (Yamamoto AE-61)


  • terraclarke likes this

#8 Astrojensen

Astrojensen

    Voyager 1

  • *****
  • Posts: 10885
  • Joined: 05 Oct 2008
  • Loc: Bornholm, Denmark

Posted 31 October 2018 - 11:43 AM

Both the Swift and Carton focusers should have the M36.4x1 accesory thread and a 1.25" adapter is easily available. M36.4/T2 adapters and a whole range of eyepiece holders and whatnot is available from Baader.

 

https://www.teleskop...-engewinde.html

 

https://www.teleskop...-25---3720.html

 

https://www.baader-p...).html?___SID=U

 

The M36.4 adapter thread was used on a lot of Japanese telescopes, also some less commonly seen ones, so check your focuser, it might be easily upgradeable to modern accesories and a whole new viewing experience. 

 

Edit: Got beaten to it. wink.gif

 

 

Clear skies!
Thomas, Denmark


Edited by Astrojensen, 31 October 2018 - 11:44 AM.

  • terraclarke likes this

#9 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 31 October 2018 - 12:01 PM

It works perfectly  and is not a mess in my opinion.

If you have this on hand then why not ?


  • Vesper818 likes this

#10 DMala

DMala

    Apollo

  • *****
  • Posts: 1216
  • Joined: 02 Jun 2015

Posted 01 November 2018 - 03:16 PM

Hi, I do not think there was an intention to put down your finding, but rather to point out that the Vixen adaptor is a very practical solution. Anyhow, thanks for sharing your finding.

#11 Vesper818

Vesper818

    Astronomess

  • *****
  • Posts: 10953
  • Joined: 21 Nov 2005
  • Loc: Treehouse Observatory

Posted 01 November 2018 - 03:41 PM

Ingenuity is always a benefit. Your solution was neither cobbled, nor a mess. Adapting what you have produced an elegant solution.

#12 starman876

starman876

    Hubble

  • *****
  • Posts: 17958
  • Joined: 28 Apr 2008
  • Loc: VA

Posted 01 November 2018 - 06:41 PM

love these adapter ideas waytogo.gif



#13 konrad

konrad

    Viking 1

  • *****
  • Posts: 878
  • Joined: 23 Mar 2016
  • Loc: South Africa Johannesburg

Posted 01 November 2018 - 11:24 PM

I too love these ideas however if its not nice and tight then attaching a heavy diagonal and a heavy eyepiece  may pop it off



#14 droid

droid

    rocketman

  • *****
  • Posts: 8378
  • Joined: 29 Aug 2004
  • Loc: Conneaut, Ohio

Posted 01 November 2018 - 11:58 PM

This might work in my Swift, but not the atco, the bigger 1.25 diagonals move the ep just far enough that they do not come to focuse , only works correctly with small .965 diagonals and eps, why I currently do not use the atco.  Still looking for televue .965 stuff, lol.



#15 terraclarke

terraclarke

    Hubble

  • *****
  • Posts: 17950
  • Joined: 29 May 2012
  • Loc: Third from the Sun

Posted 02 November 2018 - 03:19 PM

It just seems to me unwise to shove or force-fit a Chinese barlow into the threaded draw-tube of that Swift 839 like that. It’s either going to (a) get stuck, (b) contract on cooling at a different rate than the draw-tube itself and fall out some night under the weight of the diagonal and eyepiece, or get stuck and then you run the risk of damaging the focuser when you get it out. Of course you could glue it in with JB-Weld or put two sided adhesive tape around it when you shove it in to insure that it doesn’t fall out, in which case you wind up permanently creating a cobbled up mess from a valuable artifact. These Takahashi-made Swifts are not common and they are beautifully made; they aren’t your uber-common, run of the mill Tasco or something for which no easy conversion solution exists. There is an easy solution to properly converting them to a 1.25” format with a very reasonably priced, readily available, OEM Vixen visual back. Sorry, I didn’t mean to offend you. Sometimes my zeal for preservation outweighs my tact in communication.


  • sarastro, Astrojensen, Joe Cepleur and 2 others like this

#16 terraclarke

terraclarke

    Hubble

  • *****
  • Posts: 17950
  • Joined: 29 May 2012
  • Loc: Third from the Sun

Posted 02 November 2018 - 05:42 PM

Here’s the Vixen adapter that I posted a link to (see post #6) and my Swift model 839 (no. 28 of the brown Takahashi-made Swifts):

Attached Thumbnails

  • A2CB6AA5-09E2-44EA-BDE6-CD7F5B508B9E.jpeg
  • C4F0F4FE-D368-4BDC-A644-B8AD7BF813EB.jpeg


#17 terraclarke

terraclarke

    Hubble

  • *****
  • Posts: 17950
  • Joined: 29 May 2012
  • Loc: Third from the Sun

Posted 02 November 2018 - 05:43 PM

And here’s the fix:

Attached Thumbnails

  • 2FEDC2DE-1592-48A6-9DB4-A0CD3E04AF20.jpeg
  • 18A1304E-FA5C-4F8A-A8EE-7EFAECABF66B.jpeg

  • sarastro, Astrojensen and Piggyback like this

#18 apfever

apfever

    Aurora

  • *****
  • Posts: 4620
  • Joined: 13 May 2008
  • Loc: Colorado

Posted 02 November 2018 - 07:49 PM

I found that adapter for $15 shipped from Japan and it arrived in between 2 and 3 weeks, Vixen cap and all.  The same company was all over ebaay with different prices - same company - varying from $15 to about $22.  This was a less than a month ago or so.


  • terraclarke likes this

#19 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 04 November 2018 - 04:47 AM

Thanks for the Japanese adapter links .

It's just I had a Swift and Tele Vue diagonal on hand and wanted to mate them.

Do not worry , they will not have any kids .......

Again I have enough  trust in this cobbled together hybrid to carry my Tele Vue diagonal and 24mm Panoptic.

It more solid then many designed adapters although with a major caveat of possible damage to the threads if not careful , so be careful I guess.

The centre of gravity in declination must be shifted all the way back (when carrying the finder also) so the entire apparatus is heavy by 60mm 1960s standards .

But it works !

A skytour with the Swift / 24mm panoptic combo is quite something....



#20 roscoe

roscoe

    curmudgeon

  • *****
  • Posts: 9041
  • Joined: 04 Feb 2009
  • Loc: NW Mass, inches from VT

Posted 04 November 2018 - 06:59 AM

Here's a little cheat I did for my Swift, so I can use 1.25 EP's...

 

I got a Vixen adapter, and took an interesting diagonal that is built for 1.25, but has a smaller prism more like a .965, and sprayed them both with the paint we found that is close to Swift in color, and installed the system.  It looks real close to 'right' on the scope.....

 

DSCN1020.JPG


  • Vesper818, photiost, astro140 and 3 others like this

#21 The Dork of Cork

The Dork of Cork

    Lift Off

  • -----
  • topic starter
  • Posts: 19
  • Joined: 10 Jul 2016

Posted 04 November 2018 - 08:51 PM

I did not get a complete scope ( no diagonal amongst other things )

I like the EQ mount but it just cannot take the load of Tele Vue diagonal and eyepieces up to the 24mm Panoptic size .

It's on a more solid Carton EQ of 1970s vintage .

This Swift / Carton / Televue combo will most likely become my quick look planetary scope.

It was picking up difficult lunar domes no problem although a C8 alongside with a very very  good mirror was clearly overpowering it.

Crude details of Mars was seen in October ( again the C8 of late 90s vintage was giving much more detail during moments of good seeing)

It has identical diffraction discs either side of focus.

Above everything else it's quite enjoyable to use given its excellent mechanics .

It's a keeper.


  • terraclarke likes this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics