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1.25" Thread-on Eyepiece Holders for Classic Refractors

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#51 Chuck Hards

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Posted 27 October 2020 - 02:07 PM

Last month I found this combination that works great on Asahi Pentax 60mm and Asahi Jupiter 60mm scopes, apologies for the delay in posting.   1.25" adapter from SVBONY with a 42mm thread, then a 42mm-37mm step ring, then right onto the focuser barrel.  

 

Again, only a couple of threads holding the step rings in place, so I'm not using a heavy diagonal or eyepiece.  But it works great with a light payload.  Non-marring setscrew is nice on the SVBONY.

 

 

Foc 001.jpg

 

Foc 003.jpg

 

Foc 002.jpg

 

 

 

 

 

 


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#52 Kasmos

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Posted 27 October 2020 - 02:18 PM

Last month I found this combination that works great on Asahi Pentax 60mm and Asahi Jupiter 60mm scopes, apologies for the delay in posting.   1.25" adapter from SVBONY with a 42mm thread, then a 42mm-37mm step ring, then right onto the focuser barrel.  

 

Again, only a couple of threads holding the step rings in place, so I'm not using a heavy diagonal or eyepiece.  But it works great with a light payload.  Non-marring setscrew is nice on the SVBONY.

 

 

attachicon.gifFoc 001.jpg

 

attachicon.gifFoc 003.jpg

 

attachicon.gifFoc 002.jpg

What adaptor? I just like the pretty pictures! wink.png

 

Beautiful


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#53 Jaz5833

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Posted 17 November 2020 - 01:05 AM

Will the Vixen, or others, work on the 6339?



#54 Senex Bibax

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Posted 17 November 2020 - 08:22 AM

Will the Vixen, or others, work on the 6339?

Mine should arrive this week. I didn't buy it for my 6339 but I'll try it an let you know. AFAIK they don't usually fit.



#55 CharlieB

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Posted 17 November 2020 - 09:39 AM

Will the Vixen, or others, work on the 6339?

No. They only work directly with single drawtube scope.  The 6339 has a double drawtube.

 

Charlie


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#56 Pete W

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Posted 18 November 2020 - 09:33 AM

Mine should arrive this week. I didn't buy it for my 6339 but I'll try it an let you know. AFAIK they don't usually fit.

The Vixen visual back will not thread onto the pull-out tube of the 6339a or Tasco 10TE, but if you remove pull-out tube the Vixen will thread onto the larger diameter draw tube that has the focuser rack on it.

 

Tasco w 36.4 thread 6339 w step up.jpg

 

The top pic shows the Sears 6339a with a 30 to 42mm step-up ring and male-threaded visual back on the pull-out tube, just like Chuck's set-up in his most previous post.  The bottom shows the Tasco 10TE with the pull-out tube and black knurled ring removed.  Two 36.4mm thread-on extension tubes along with the Vixen 36.4mm visual back are threaded onto the larger diameter focuser tube.  This still needs another slip-in extension tube for the scope to reach focus.  


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#57 AndresEsteban

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Posted 02 December 2020 - 11:50 AM

Another solution is to pick up a 0.965" to 1.25" adapter, cut the 0.965" and machine a new 36.4 mm thread on the 1.25" holder. This apporach has the advantage of a low length (13mm) profile coming out of the drawtube and almost the same internal length for the 1.25" ep barrel (25 mm) with a compression ring..

 

1.25" eyepiece - focuser adapter for vintage refractors with 0.965" original ep
 
1.25" eyepiece - focuser adapter for vintage refractors
 
1.25" adapter for vintage refractors
 
1.25" eyepiece - focuser adapter for vintage refractors
 
1.25" eyepiece - focuser adapter for vinatge refractors
 
MILO (SYW) 60mm f/13 vintage refractor
 
76.2mm (3-in) f/16 Dean Beam (OKKK), vintage refractor
 
76.2mm (3-in) f/16 Dean Beam (OKKK), vintage refractor

 

 

Clear skies for us all!
Andy


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#58 MisterDan

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Posted 02 December 2020 - 12:35 PM

That's an excellent idea, Andy, and a great example of thinking "outside the box," as they say.  Did you increase (ream) the bore of the adapter, as well, or did your initial cut eliminate the smaller diameter?

 

Best wishes, and thanks for sharing.

Dan


Edited by MisterDan, 02 December 2020 - 12:37 PM.

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#59 AndresEsteban

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Posted 02 December 2020 - 06:06 PM

That's an excellent idea, Andy, and a great example of thinking "outside the box," as they say.  Did you increase (ream) the bore of the adapter, as well, or did your initial cut eliminate the smaller diameter?

 

Best wishes, and thanks for sharing.

Dan

Dan, the guy from the mechanical workshop just cut the  main 1.25" body about (40 mm OD)  1 mm above its end (see the Fig 1, the removed 0.965" part it's painted in green). What was left is a 1.25", 40 mm OD cilinder (filled in blue color). Then using the lathe que reduced the external diameter, 40 mm OD, to something a little bit around 37 mmalong 10-11 mm in length. Then the 36.4 thread was done leaving 13 mm of the original 1.25", 40 mm OD body (blue cilinder). Now the finished piece is shown in Figure 2, filled in red color.


Figure 1

esquema


 
Figure 2
adaptador tubo para 1.25 polegadas

 
 
Clear skies for us all!
Andy

 


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#60 Beastmaster

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Posted 02 December 2020 - 11:42 PM

The Vixen visual back will not thread onto the pull-out tube of the 6339a or Tasco 10TE, but if you remove pull-out tube the Vixen will thread onto the larger diameter draw tube that has the focuser rack on it.

 

attachicon.gifTasco w 36.4 thread 6339 w step up.jpg

 

The top pic shows the Sears 6339a with a 30 to 42mm step-up ring and male-threaded visual back on the pull-out tube, just like Chuck's set-up in his most previous post.  The bottom shows the Tasco 10TE with the pull-out tube and black knurled ring removed.  Two 36.4mm thread-on extension tubes along with the Vixen 36.4mm visual back are threaded onto the larger diameter focuser tube.  This still needs another slip-in extension tube for the scope to reach focus.  

Where does one get 36.4mm thread on extension tubes?  I have one that came with one of my Mayflowers, but I need extra length.  Any good, current sources?

 

Thanks!


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#61 Pete W

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Posted 03 December 2020 - 12:26 PM

Fred, I've only been able to pick one up in the used equipment market.  Vixen used to make them but I think they've been discontinued.   I could not find a source of new thread-on tubes.  One of the more experienced scope collectors/restorers here on CN may have other options or sources.   



#62 Defenderslideguitar

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Posted 03 December 2020 - 12:43 PM

Posted 31 August 2020 - 06:49 PM

possibly another source ? 21,99   free shipping

 

https://www.ebay.com...353.m2749.l2649

 

 

I posted the above the last day of August       it was estimated to arrive in late November  I am hopeful it will get here soon

I had one already for use on my Mayflower 814    but I switched it over to the 1958 Tasco 10te  and ordered this other one to have two...…..Seller is still listing them   and shipping is now faster   estimated for January



#63 Beastmaster

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Posted 03 December 2020 - 01:53 PM

Posted 31 August 2020 - 06:49 PM

possibly another source ? 21,99   free shipping

 

https://www.ebay.com...353.m2749.l2649

 

 

I posted the above the last day of August       it was estimated to arrive in late November  I am hopeful it will get here soon

I had one already for use on my Mayflower 814    but I switched it over to the 1958 Tasco 10te  and ordered this other one to have two...…..Seller is still listing them   and shipping is now faster   estimated for January

Thanks - I have one of those - I'm thinking of a 36.4mm to 36.4mm tube (female to male) extension tube.  My Mayflower (H.O.C.) came with one (see below), that doesn't quite thread in perfectly.  I need another one to get enough draw to reach focus on my Mayflower RAO with the pull draw tube.  I'm close, but just not close enough.  I think I need another one or two more.

Very elusive part.

 

IMG_0875.JPG



#64 Kasmos

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Posted 03 December 2020 - 02:16 PM

Perhaps you could use a empty 1.25" barlow as an extension tube.

 

I believe that's what Robert was saying in post#35

 

 https://www.cloudyni...ors/?p=10468707


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#65 Pete W

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Posted 03 December 2020 - 03:05 PM

Yep, I've not been able find a vendor for these.  I snagged one posted on CN Classifieds a few months ago but haven't seen once since.

 

Thanks - I have one of those - I'm thinking of a 36.4mm to 36.4mm tube (female to male) extension tube.  My Mayflower (H.O.C.) came with one (see below), that doesn't quite thread in perfectly.  I need another one to get enough draw to reach focus on my Mayflower RAO with the pull draw tube.  I'm close, but just not close enough.  I think I need another one or two more.

Very elusive part.

 



#66 Bomber Bob

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Posted 03 December 2020 - 03:23 PM

Perhaps you could use a empty 1.25" barlow as an extension tube.

 

I believe that's what Robert was saying in post#35

 

 https://www.cloudyni...ors/?p=10468707

Old Tele Vue 2.5x Barlow upper half works with the 30mm pull-tube / coarse focus on my Sears 6336:

 

Sears 6336 - Televue 125 Adapter S01.jpg


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#67 MisterDan

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Posted 03 December 2020 - 03:43 PM

M36.4 to T2 adapters are common, as are T2 extensions.  You can switch to the T2 format and utilize a T2-to-1.25-inch visual back.

Sequence would be:  M36.4-T2 adapter + T2 extension + T2-1.25-inch visual back.  (Edit:  there are both male and female T2-to-1.25-inch visual backs.  Most of the M36.4mm-T2 adapters utilize male T2 threads, so a female T2-to-1.25-inch back may be "easier" to adapt.  Baader makes at least two such backs.)

 

M36.4 extensions are, indeed, hard to find, now.  I know the Tasco VR9, VR99, and VR999, each came with an M36.4 extension.  Not sure about the Celestron and/or Meade 60mm f/5s.

 

Best wishes and luck.

Dan


Edited by MisterDan, 03 December 2020 - 04:14 PM.

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