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Yamamoto <SYW> AE-80 f/15 triplet

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#1 Marco1968

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Posted 20 May 2017 - 06:32 AM

Greetings,

while looking at an old Yamamoto <SYW> catalogue, referenced in several past threads, the AE-80 f/15 model caught my attention.

The catalogue shows, nearby the photo of the telescope, a section of the objective cell between the tube end and the stray light shield.

Looking at the section, the lens appers to be a triplet that I think is very uncommon in the time when (to my knowledge) achro doublets where the norm and artificial fluorite was behind the corner but not yet industrially used.

I found only one old CN thread with images of a sample of this telescope, indeed the photo of the objective shows two groups of shim spacers aparts demonstrating that it is indeed a triplet.

I am fascinated by this instrument and really curious hence asking if some passionate experts here know more or actually own and use a Yamamoto AE-80 f/15 triplet.

I am grateful to anybody will provide more information on this telescope.

Thanks for your consideration and
Clear Skies

Marco
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#2 Terra Nova

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Posted 20 May 2017 - 06:57 AM

Could the second set of spacers be between the objective element and the back of the blackened cell itself? Can you link us to a picture?



#3 Marco1968

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Posted 20 May 2017 - 07:16 AM

Hi Terra,

this link goes to the 2010 whith several images of a telescope that should be an AE-80 f/15 triplet.

Other than image of the objective showing the two groups of shims, the owner is pretty sure this is indeed a triplet.

Moreover, the overall look of the OTA is to me identical to the AE-80 in the catalogue. Note the special design of the dewshield...

https://www.cloudyni...a-take-a-guess/

Really interesting telescope!
Maybe the peak in amateur non-fluorite (or ED type glass) lens making before the transition to more modern products?

Best Regards
Marco
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#4 Marco1968

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Posted 20 May 2017 - 07:39 AM

Here below a snapshot from the Yamamoto catalogue showing the AE-80

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  • 20170520_143634.png

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#5 Marco1968

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Posted 20 May 2017 - 07:41 AM

Here below an enlarged wiew of the objective scheme, showing the triplet on the right.

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  • 20170520_143702.png

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#6 Terra Nova

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Posted 20 May 2017 - 09:18 AM

Thank you Marco! I would imagine that to be an amazing telescope! I have very high admiration for SYW/Yamamoto telescopes. They are excellent instruments. My Sears 6344 76mm x 1209mm is truly a wonderful instrument for an achromat.


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#7 Mr Magoo

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Posted 20 May 2017 - 09:09 PM

I wonder if Greju still has his? He has not been active on CN for some time. 



#8 diglit

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Posted 21 May 2017 - 12:34 PM

It could be the same of Takahashi TS-80? 

 

Paolo


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#9 rolo

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Posted 21 May 2017 - 12:55 PM

Tak TS 80 triplet

 http://www.astrosurf...80_f15_1970.jpg


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#10 Marco1968

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Posted 22 May 2017 - 04:23 AM

Greetings,

 

inspired by the above comments, I've made some search on the Takahashi TS 80, this is what I've found, with Bibliographic reference a the bottom of the text.

 

"The story of Takahashi had its beginnings in 1932, when Kitaro Takahashi founded a sand casting factory on the outskirts of Tokyo. After the desolation of World War II, his factory switched to making aluminum parts for optical instruments.
Realizing the profit margins to be gained from constructing whole telescopes in house, Takahashi decided to try his hand making his own optics, and by 1967 he had succeeded in bringing to the market his first refracting telescope, the TS65 refractor (doublet achromat 65 mm f/14). By 1969, the company had produced its first 65 mm triplet semi-apochromat as well as a 100 mm f/10 reflector. This was followed in 1972 by the TS80, the first apochromat ever built.
The company had developed ways of artificially growing calcium fluorite (CaF2) in the laboratory, a synthetic mineral that [...] could provide superb color correction when matched with a suitable element. This TS80 was used to photograph the total solar eclipse of June 29, 1973, in Africa. It was an 80 mm x 1,200 mm and was offered with a sturdy equatorial mount with a built-in polar telescope.
In 1977 Takahashi introduced its second triple fluorite apochromat, the TS-90, a 90 mm f/11 instrument, followed in 1979 by two state-of-the-art mounts, the 1990s and the now legendary JP mount. In the same year, the fluorite Series FC 65, 78, 100 and 125 were introduced. this series remained in production until 1994."

 

Abstract from "Classic Telescopes - A Guide to Collecting, Restoring, and Using Telescopes of Yesteryear"
Author: English, Neil

Publisher - Springer
ISBN 978-1-4614-4424-4

 

Hence, I think it is highly possible that the 80mm f/15 triplet shown in the old Yamamoto <SYW> catalogue is indeed made by Takahashi used in the TS 80. If I'm not stating a definite answer is just because I'm in no way an expert smirk.gif

 

Thanks everyone for the feedbacks !

Clear Skies,

 

Marco


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#11 deSitter

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Posted 22 May 2017 - 07:55 AM

This is just fascinating - from what I see the AE-80 was the 2nd line scope behind the famous AE-106 108/1600 scope. It turns out that Yamamoto and Takahashi were relatives! Takahashi understood optics but Yamamoto did not, he was more a mechanical engineer. So that AE-80 is possibly a transitional stage to a full f/9 fluorite triplet APO. Remember Takahashi had to grow his own fluorite crystal glass. The optical manufacture problem of making a triplet would still be the same with a third element of abnormal flint. You wouldn't need much extra correction at f/15 to get completely colorless performance.

 

-drl



#12 Terra Nova

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Posted 22 May 2017 - 08:11 AM

"Realizing the profit margins to be gained from constructing whole telescopes in house, Takahashi decided to try his hand making his own optics, and by 1967 he had succeeded in bringing to the market his first refracting telescope, the TS65 refractor (doublet achromat 65 mm f/14). By 1969, the company had produced its first 65 mm triplet semi-apochromat as well as a 100 mm f/10 reflector. This was followed in 1972 by the TS80, the first apochromat ever built."

 

So how does this fit with the chronology of the Takahashi-built Swifts? My 60mm is the 28th built and I thought it dated from 1965?


Edited by terraclarke, 22 May 2017 - 08:11 AM.


#13 diglit

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Posted 22 May 2017 - 01:06 PM

It's really easy things are so...

The same for the GoTo 80/1200 triplet. (I have the achro doublet - wonderful!)

TS-80 from Takahashi are quite rare, in Japan sometimes one piece compares on the market (price around 600/900 USD + shipping).

The first TAKA ever built is the TS 65/900 achro (I have one), really nice little scope with great optics.

The TS65/1000 (triplet was born 2 years later).

 

http://www.dark-star...ashi-ts-65-900/

 

Link in italian, as usual, but.. use google translator please.

 

Paolo


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