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

Takahashi Twin View binoviewer

  • Please log in to reply
13 replies to this topic

#1 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:41 AM

Thats beautifull binoviewer made in Japan, by Takahashi, made in April of year 1996, and there was made only 1 run of these, in very low quantities.

 

Mechanics, as expected, made by high Tak percision.
Bino is angled at 45 degrees. (same like Angled Carl Zeiss binoviewer)

 

Eyepeice holders works very smooth, as real self centring design.

 

By changing IPD, you actually change focus, which can be annoying for some, but for most, and me, its not problem at all. (same like Angled Carl Zeiss binoviewer)

On back side, there is 2x Takahashi OCS which can be very easily removed - unscrewed.

Telescope connection is 2" unscrewable.

 

Techniall specifications unknown untill today:

 

Coatings: MgF2
Prisms diameter: 22mm
Clear Aperture (lowest, effective): 13mm
Optical path (without 2x OCS installed): 14.3cm
Weight: 736g

 

Optical performance excellent, like expected from Takahashi company.

 

I did short comparation Takahashi binoviewer vs Carl Zeiss Angled binoviewer:

 

Generaly, pict quality same as Zeiss, except Tak bino have several more ghostings vs Zeiss on bright objects, especially Jupiter (not bothersome for me, just ignored them).

Zeiss is more robust and feels more compact.
Tak is lower in weight, and takes more light path vs Zeiss.
Zeiss have much more effective Clear Aperture.
Tak is much more complicated to collimate vs Zeiss.

 

While field top 13mm is setted deeply inside binoviewer (on back side of beamsplitter), it allow to using eyepeices with much larger field stops than 13mm to not notice vignetting directly.

 

Kind regards
Denis, binoviewers expert

Attached Thumbnails

  • IMG_20190627_135858-1008x756.jpg
  • IMG_20190627_140047-1008x756.jpg


#2 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:42 AM

...bottom side...

Attached Thumbnails

  • IMG_20190627_135930-1008x756.jpg


#3 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:43 AM

...inside look...

Attached Thumbnails

  • IMG_20190627_123544-768x1024.jpg

  • rerun likes this

#4 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:45 AM

...OCS showed...

Attached Thumbnails

  • IMG_20190628_145523-768x1024.jpg
  • IMG_20190627_123614-1024x768.jpg

  • rerun likes this

#5 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:48 AM

...paperwork all pages showed...

Attached Thumbnails

  • PhotoPictureResizer_190702_174655187_crop_3024x4032-768x1024.jpg

Edited by denis0007dl, 02 July 2019 - 10:49 AM.


#6 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:49 AM

...more...

Attached Thumbnails

  • IMG_20190627_140003-1024x768.jpg


#7 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 02 July 2019 - 10:51 AM

...and last page.

 

Now, finally, I hope you have ALL infos about that binoviewer like never before :)

 

Hope many will find it very usefull in future.

 

Kind regards

Denis, binoviewers expert

Attached Thumbnails

  • IMG_20190627_140008-768x1024.jpg

  • rerun likes this

#8 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 17,776
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 02 July 2019 - 07:49 PM

Denis, why is the optical path so long?  I thought being 45° It would be a lot shorter.



#9 EverlastingSky

EverlastingSky

    Viking 1

  • *****
  • Posts: 965
  • Joined: 12 Sep 2006
  • Loc: Vancouver Canada

Posted 02 July 2019 - 07:51 PM

Interesting, thank you for posting this information. I am somewhat disappointed that Takahashi has not released a binoviewer of some type again in more recent times.



#10 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 03 July 2019 - 01:09 AM

Denis, why is the optical path so long?  I thought being 45° It would be a lot shorter.

Overal built design.

Takahashi knows why they did it like that.



#11 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 03 July 2019 - 01:11 AM

Interesting, thank you for posting this information. I am somewhat disappointed that Takahashi has not released a binoviewer of some type again in more recent times.

You are welcome.

 

Yeah, we all would like newer upgreaded release.



#12 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 7,423
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 03 November 2019 - 03:23 PM

Presumably the Twin Viewer could be fitted to the also discontinued dome turret Tak made.

Attached Thumbnails

  • tak_tlk21000nr_system_chart.png


#13 De Lorme

De Lorme

    Surveyor 1

  • *****
  • Posts: 1,986
  • Joined: 30 Dec 2008

Posted 03 November 2019 - 04:03 PM

Thanks Dennis for posting this,   Just to make sure is the OCS 2"?  If so are the threads a standard 48mm for filters?

 

Clear Skies,

 

De Lorme



#14 denis0007dl

denis0007dl

    Binoviewers Expert

  • *****
  • Vendors
  • topic starter
  • Posts: 2,222
  • Joined: 17 Apr 2012
  • Loc: Umag, Croatia, Europe

Posted 03 November 2019 - 04:18 PM

De Lorme, OCS is smaller than 2".
Didnt measure exact size and step of thread.


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