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Older Tak 40mm Ortho TS-012

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24 replies to this topic

#1 Chuck Hards

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Posted 10 November 2019 - 10:55 PM

I've found very little on CN about this eyepiece, I think it dates from the 70's.  The threads that couple it to the 2" adapter are the same as the Vixen visual back, 36.4mm, so a 1.25" adapter would probably reduce the outer field illumination a bit, but not objectionably so and maybe not even noticeable.

 

This eyepiece is huge, that is a standard 1.25" volcano-top 12mm Kellner for comparison.   I have not tried it yet.

 

Any information or user reports are most welcome.  Due to it's age, I thought I'd bring it up here first, if it gets no traction in Classics, it can be moved to Eyepieces.  Thanks!

 

 

40mm ortho 005a.jpg  40mm ortho 004a.jpg

 

40mm ortho 002a.jpg  40mm ortho 001a.jpg


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#2 Esso2112

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Posted 10 November 2019 - 11:13 PM

I have a slightly newer version (Multicoated). It’s one I keep meaning to try out, but honestly haven’t run it through the paces yet. 


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#3 shaesavage

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Posted 11 November 2019 - 10:09 AM

I also have the MC version with a 2" adapter. I haven't tried it with many of my telescopes, but I haven't been able to achieve focus. When using it with a 2" diagonal in my Televue Genesis SDF, I need more in-travel. When I attach it directly to a Baader T2 1.25" prism, focus is easily achieved. My plan is to find a 1.25" adapter.



#4 sdedalus83

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Posted 11 November 2019 - 10:20 AM

https://www.mrstargu...uct-p/3728.htm=


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#5 Chuck Hards

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Posted 11 November 2019 - 10:40 AM

Thanks!  I just ordered one.  I had started looking for one of these, my "classic" options with a 2-inch focuser are not as extensive as my 1.25" choices, but you saved me the time.  Appreciated!


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#6 Chuck Hards

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Posted 11 November 2019 - 10:42 AM

I wonder what Takahashi's motivation was for producing this large, low-power ortho?   



#7 Terra Nova

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Posted 11 November 2019 - 11:33 AM

I wonder what Takahashi's motivation was for producing this large, low-power ortho?   

Given the diameter and threads, I would imagine it was intended for straight-thru low-power viewing much like the big Zeiss thread-in 40mm Huygens.


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#8 sdedalus83

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Posted 11 November 2019 - 11:45 AM

The long triplets on really tall mounts - 30x and 1.67 degrees in an 80mm f15


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#9 Chuck Hards

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Posted 11 November 2019 - 12:21 PM

I never understood the Japanese predisposition for straight-though viewing with a refractor.  Theoretically, it makes sense from a throughput standpoint, in the days before really good AR coatings, but the ergonomic trade-off makes it a deal killer, IMO.  

 

I just don't bend like I used to, darnit.


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#10 Terra Nova

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Posted 11 November 2019 - 02:54 PM

I never understood the Japanese predisposition for straight-though viewing with a refractor.  Theoretically, it makes sense from a throughput standpoint, in the days before really good AR coatings, but the ergonomic trade-off makes it a deal killer, IMO.  

 

I just don't bend like I used to, darnit.

I wholeheartedly agree! That’s why I never got the big Zeiss 44mm Huygens. I can’t do the straight thru and if my neck would allow it, I’m too tall. Otherwise, it would have to go into a Zeiss Amici turret which I don’t have. 



#11 sdedalus83

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Posted 11 November 2019 - 03:18 PM

Here's the best way to go.

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#12 Chuck Hards

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Posted 11 November 2019 - 03:24 PM

For my big Mak, maybe, not a small refractor.  The eyepiece alone is too massive. 



#13 DreamWeaver

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Posted 11 November 2019 - 04:23 PM

You could always duct tape a counter weight on the other end of the scope Chuck.  wink.gif



#14 Chuck Hards

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Posted 11 November 2019 - 04:42 PM

Ankle weights. waytogo.gif



#15 sdedalus83

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Posted 11 November 2019 - 06:03 PM

3.25lbs of cold hard cash and a clearance shoulder "slimming" strap - cheaper than the ankle weights. 

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#16 Chuck Hards

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Posted 11 November 2019 - 06:25 PM

Ex-wife left the ankle weights behind, about all she left behind.  You have no clue just how expensive those ankle weights were.



#17 Chuck Hards

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Posted 12 November 2019 - 09:46 AM

I got a shipping notice that the 1.25" adapter is on it's way.  Good timing, I got the last one in stock.  Report when it gets here.  I don't want to try it out with a short-focus objective and the 4" f/15 Jaegers is the only really long, classic achromat I currently have with a 2" focuser that's ready to use, though I suppose I should also try it with my 100mm ED.

 

I'm not a big fan of turrets, even though I have a Unihex as well as Celestron MOH.  



#18 Terra Nova

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Posted 12 November 2019 - 01:19 PM

Here's the best way to go.


Wow! That looks just like the Zeiss! Is it correct-image utilizing an oversized Amici prism system?

#19 sdedalus83

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Posted 12 November 2019 - 02:08 PM

Wow! That looks just like the Zeiss! Is it correct-image utilizing an oversized Amici prism system?

No, it's just a mechanical turret, like the ones on the old 60s and 70s spotting scopes.  It's not mine.  I also remember seeing an erecting prism turret with one 36.4mm port, but I couldn't find a picture.


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#20 stevep

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Posted 12 November 2019 - 02:29 PM

It's not mine.

No It was mine, before I sold it some years ago,

 

it's actully a STD 36.4mm Vixen straight through turret, that has been modified to incorporate a 1.25 diagonal, making for more comfortable viewing,

has 3 0.965 ports and 1 36.4mm port, it worked very well, I did not do the conversion it was like it when I purchased it, here is another view showing the diagonal attached,

 

Steve

 

p1010080.jpg


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#21 Chuck Hards

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Posted 12 November 2019 - 08:06 PM

The right-angle prism is much preferred over a roof, no matter who made it.  I really like that.  



#22 Terra Nova

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Posted 13 November 2019 - 12:47 PM

The right-angle prism is much preferred over a roof, no matter who made it.  I really like that.  

I would agree in most cases, and in all cases as per my own experience. I have never myself used a Zeiss Amici turret, however those seasoned observers who have often swear by them.



#23 Ohmless

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Posted Yesterday, 12:27 AM

amazing find!



#24 pancho61

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Posted Yesterday, 03:14 PM

Hello,

 

I have the Vixen turret that Steve have not so easy to use as if you use an Big diagonal it a little bit hard to turn. If you can found the model with three output could be more easy. 

 

 

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#25 Chuck Hards

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Posted Yesterday, 10:23 PM

I'm all set now, the 1.25" adapter arrived today.  Fit perfectly.  I love this community, someone always has the answer to just about any problem.   Many thanks!

 

The problem that nobody can help with is that a snow storm is coming in Saturday night, so I may only get to try it out terrestrially for at least another week.  

 

 

40mm ortho 006a.jpg  40mm ortho 007a.jpg  40mm ortho 010a.jpg  

 

 


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