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Are there still 80/1200 mm refractors produced in japan todays ?

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#1 AaronM

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Posted 27 January 2018 - 09:42 AM

Hello friends,

 

a few days ago I found somewhere here on CN a thread about a new japanese 80 mm f/15 refractor. But I can not find it again.....

 

Is it true, that where is an actual manufacturer in japan, who produce still long focus achromats like 80/1200 ?

Do you may have a link ?

 

Thank you very much !

 

Kind regards, Michael



#2 solarGain

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Posted 27 January 2018 - 10:05 AM

https://www.cloudyni...-new-refractor/

 

This should do it.

John



#3 AaronM

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Posted 27 January 2018 - 10:18 AM

Sorry John, thats only a monocular.

 

kind regards Michael



#4 Andy Howie

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Posted 27 January 2018 - 12:27 PM

 The following company offers smaller achromats, eg: 60/1200 & 80/1200  , with modern coatings, made in Tokyo.

 

http://scopetown.co.jp/

 

60mm = http://scopetown.co....P/HSDX6120.html

 

80mm = http://scopetown.co....P/HSDX8120.html

 

Use a page Translator to get all the info.

 

Cheers,

Andy.


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#5 deSitter

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Posted 27 January 2018 - 12:38 PM

Chances are good these were made in China. You're far better off looking for an old Sears or Tasco scope. No plastic, great optics.

 

-drl



#6 sdedalus83

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Posted 27 January 2018 - 12:47 PM

http://scopetown.co....P/HSDX8120.html

 

Not sure if they are actually in stock or if they ship out of Japan.  It looks like 100 are made per year, probably by vixen.



#7 Andy Howie

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Posted 27 January 2018 - 12:49 PM

They are made in Tokyo by Starlight Corporation Ltd.(or so the badge says.)

 

ScopeTech STL80A-MAXI badge.jpg

 

The following blog(link was hidden somewhere in ScopeTech web pages) shows various stages of lens manufacturing  of the 80mm version.

 

https://blogs.yahoo....o/32155110.html

 

Andy.


Edited by Andy Howie, 27 January 2018 - 12:52 PM.


#8 deSitter

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Posted 27 January 2018 - 12:52 PM

They are made in Tokyo by Starlight Corporation Ltd.

 

attachicon.gif ScopeTech STL80A-MAXI badge.jpg

 

The following blog(link was hidden somewhere in ScopeTech web pages) shows various stages of lens manufacturing  of the 80mm version.

 

https://blogs.yahoo....o/32155110.html

 

Andy.

I understand but even Vixen outsources stuff.

 

-drl



#9 Andy Howie

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Posted 27 January 2018 - 01:02 PM

If you read through various pages of their website, what seems to stand out, is their pride in offering actual Japan made items. 

 

I don't know how easy these would be to buy for those outside Japan though.



#10 AaronM

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Posted 27 January 2018 - 01:04 PM

Thanks Andy, thats it !

Michael Aaron


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#11 deSitter

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Posted 27 January 2018 - 01:09 PM

 The following company offers smaller achromats, eg: 60/1200 & 80/1200  , with modern coatings, made in Tokyo.

 

http://scopetown.co.jp/

 

60mm = http://scopetown.co....P/HSDX6120.html

 

80mm = http://scopetown.co....P/HSDX8120.html

 

Use a page Translator to get all the info.

 

Cheers,

Andy.

They even have old timey blue AR coatings. Retro!

 

-drl



#12 sdedalus83

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Posted 27 January 2018 - 01:10 PM

They don't offer international shipping through their Amazon store, I've tried to buy eyepieces.  You could use a proxy, which would probably cost $100-150.  It's hard to know without actual dimensions 



#13 AaronM

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Posted 27 January 2018 - 01:24 PM

Yes its sadly that this project will stay a small batch series....maybe some american or european dealers would announce interest in greater batches ?

Kind regards Michael Aaron



#14 deSitter

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Posted 27 January 2018 - 01:28 PM

Yes its sadly that this project will stay a small batch series....maybe some american or european dealers would announce interest in greater batches ?

Kind regards Michael Aaron

Unitron 2.0! They died as far as telescope making was concerned when Nihon Seiko closed its doors.

 

-drl



#15 photiost

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Posted 27 January 2018 - 04:51 PM

From their website (translated):

 

"Caliber 80 mm Focal length 1200 mm 4 surface multicoating (HTM coating) Maximum transmittance 99.9% or more (1 surface · actual measurement / d line 587 nm average transmittance 400 nm ~ 700 nm 99.8% or more) Objective lens matting Covering"

 

There are also various images posted, one in particular shows 2 telescopes (stacked) - one has the normal coatings vs the HTM coatings. The differences are evident.

 

Looks like a nice product.



#16 leveye

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Posted 27 January 2018 - 09:11 PM

At 399.99 USD you'd be better off finding a Towa under the many names they are branded. One complete rig just sold for 75 dollars. The deals are still out there.


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#17 Astrojensen

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Posted 28 January 2018 - 04:13 AM

If you ask me, Scopetown made a big mistake in the design of their new 80/1200 achromat: They didn't put a modern 2" focuser on it or at least made it optional. 2" eyepieces and accesories are commonplace today and can REALLY open up the throttle on a 80/1200mm refractor, especially in deep-sky observing, but also if you want to use a binoviewer. 

 

 

Clear skies!

Thomas, Denmark


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#18 sdedalus83

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Posted 28 January 2018 - 04:22 AM

If you ask me, Scopetown made a big mistake in the design of their new 80/1200 achromat: They didn't put a modern 2" focuser on it or at least made it optional. 2" eyepieces and accesories are commonplace today and can REALLY open up the throttle on a 80/1200mm refractor, especially in deep-sky observing, but also if you want to use a binoviewer. 

 

 

Clear skies!

Thomas, Denmark

I get the feeling making it less desirable for people outside of a very small subset of Japanese hobbyists was a design goal instead of an oversight.



#19 Astrojensen

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Posted 28 January 2018 - 04:37 AM

 

If you ask me, Scopetown made a big mistake in the design of their new 80/1200 achromat: They didn't put a modern 2" focuser on it or at least made it optional. 2" eyepieces and accesories are commonplace today and can REALLY open up the throttle on a 80/1200mm refractor, especially in deep-sky observing, but also if you want to use a binoviewer. 

 

 

Clear skies!

Thomas, Denmark

I get the feeling making it less desirable for people outside of a very small subset of Japanese hobbyists was a design goal instead of an oversight.

 

I don't think so. I think they just made them "the way they've always been made", because "that's how it's always been done here". I don't think there are any ulterior motives behind it, it just never occurred to them that there might be people who could be interested in a 2" focuser on this scope. 

 

 

Clear skies!
Thomas, Denmark 


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#20 lylver

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Posted 18 January 2020 - 02:07 PM

Long time and efforts made. We managed to order some of the current japanese objectives.

 

Here is the best : the MAXI 80/1200 on which a special care is done.

I was curious about the level of quality after forty years of sleep. Glass composition has changed a bit, so the old machines (classic cup figuring and polishing) needed expert hands.

 

The level of quality they made advertising about is now reached.

I ordered a classic evaluation, as usual for modern instrument it is made on green color e 546nm ray

Foucault.png Star-Test.jpg

 

plus I asked to include the old classic D ray measurement to evaluate planetary use.

 

PtV.jpg Certificate.jpg

Chromatic residue : 2.71
Ray & Wavelength / Marechal Rms Value & comment
 F     486nm         0.043              0.93 strehl
 e     546nm         0.029              0.967 
 D     589nm         0.027              0.972 
 C     656nm         0.020              >0.98 strehl with PtV lambda/9

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#21 sdedalus83

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Posted 18 January 2020 - 03:45 PM

That looks pretty darn good. I found some information suggesting Daiichi(a link on Daiichi's site to scopetown as a vendor) makes at least some of scopetown's products. Both Daiichi objectives I have are quite good. The Starbase 80 looks like it might be from the same source - eyepieces and focuser are the same and scopetown is selling an 80mm f10 objective. 

 

Thanks for the follow up, do you mind describing the acquisition experience?



#22 Wildetelescope

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Posted 18 January 2020 - 09:22 PM

At 399.99 USD you'd be better off finding a Towa under the many names they are branded. One complete rig just sold for 75 dollars. The deals are still out there.


That is what I did;-). 80 mm f15 towa Excellent optics. Check out the classic scopes group.

Jmd

#23 lylver

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Posted 19 January 2020 - 03:25 AM

If you ask me, Scopetown made a big mistake in the design of their new 80/1200 achromat: They didn't put a modern 2" focuser on it or at least made it optional. 2" eyepieces and accesories are commonplace today and can REALLY open up the throttle on a 80/1200mm refractor, especially in deep-sky observing, but also if you want to use a binoviewer. 

 

 

Clear skies!

Thomas, Denmark

Certainly no, this was the purpose of my previous post when the topic was properly sorted in the Classic Telescopes section.

 

 => This is a dedicated planetary refractor : that has always been the purpose of the two founder, the revival of the Mizar "Kaiser" 80/1200 that was still built around 1980. This done with same tools coming back from the cellar and same people to use it.

 

see https://scopetown.co...P/HSDX8120.html

 

 

Let's take a look at the path to the revival of this 8-cm F15 long focal length achromatic lens barrel.

A long-focus achromat refracting telescope that has disappeared recently. One of the things that made me wonder if I could revive it was that I got a Mizar "Kaiser" found at a recycle shop.

The 8-cm refracting telescope was manufactured 37 years ago°. It was a giant telescope designed with a long focal length of F15 and 1200mm to bring out the performance of the achromatic lens. At the time of sale, 8 cm diameter was a high-end model, /.../

° : wrote at the time the the company started : so about 42 years ago now. 

 

The way it was designed and built makes it non-sense to put a 2" focuser on it. The only enlarge the adapter M36.4 Zeiss/Vixen thread / Zeiss/Vixen 24.5mm to 1"1/4 to use modern eyepieces standard

The 36.4mm thread can be used with a AH 40mm (~ Kellner with special tuned CVD) screwable eyepiece they still produce.

You can also use a M36.4 to T2 rotating adapter for bino use.

 

But the focuser baffle should be removed to let the clear aperture limit (27mm brings 70% vignetting) grow up to 32mm.

 

More diameter on the focus cause much aberration with the 80f15 objective lens design because it is strongly tuned for planetary/moon/solar use.

coma is tuned around D ray, spherical between D and C ray.


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#24 Dave1066

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Posted 12 April 2020 - 06:00 AM

That is what I did;-). 80 mm f15 towa Excellent optics. Check out the classic scopes group.

Jmd

This thread is very interesting, all the threads that talk about the Starbase 80, have got me interested enough that I have emailed Scopetech to order a 80mm F15 Maxi from them. Even though I own a Towa 80mm F15. So that I could do a direct comparison and sell the loser!

 

Some differences between the two telescopes. The Towa 80mm F15 only has 1 baffle in the OTA tube, and 1 baffle in the focuser tube, if you intend to use 1.25" eyepieces you need to knock out the baffle in the focuser tube, or accept vignetting. The paint in the Towa OTA tube is patchy ( best to repaint or flock ). The lens on Towa do not have blackened edges. The coating on the lens of the Towa is MgF2. Towa had patchy quality control manufacturing the lens, ranging from poor to excellent. 

 

The Scopetech 80mm F15 has 3 baffles in the OTA tube, the inside of the OTA tube in painted very well, the lens have a modern lens coating on all surfaces, the lens coating is HTM, and has 99.9% transmittance. The lens have blackened edges. The Scopetech can take a 1.25" eyepiece out of the box. 

 

So at least on paper the Starbase 80 F10 and Scopetech 80mm F15 have advantages over the old Towa's. That's why I'm buying one for example, if Scopetech will sell directly to the UK to a private individual. 

 

David


Edited by Dave1066, 12 April 2020 - 06:00 AM.

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#25 25585

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Posted 12 April 2020 - 06:44 AM

There are Takahashi sellers in the UK who could get you a Starbase I expect. Try Trutek Astro.


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