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Review: Binoviewers (Zeiss, Baader, William Optics, Siebert, Denkmeier......)

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#576 denis0007dl

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Posted 16 October 2018 - 10:30 AM

....and here is showed inner optic setup-simmilar like angled Zeiss.

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  • IMG_20181010_182136-1040x780.jpg

Edited by denis0007dl, 16 October 2018 - 10:30 AM.

 

#577 denis0007dl

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Posted 01 November 2018 - 10:51 AM

BINOVIEWERS COLLIMATION

 

IMPORTANT FOR ALL USERS WITH T2 MALE PLATES ON EACH EYEPEICE SIDES:

 

Collimation differs with every eyepiece holder you use. For example, Baader ClickLock eyepiece holders wont have same collimation position/point like will have Baader Helicall eyepeice holders and other eyepiece holders. Each eyepiece holder have several start positions of T2 thread, so collimation achieved even with same eyepiece holder, used on same T2 plate, will differ if you screw it on at different start position of T2 thread!
Same is worth for all other eyepiece holders, and all have different collimation points/positions!

 

IMPORTANT FOR ALL BAADER HELICAL EYEPIECE HOLDER USERS:

 

If you use Baader Helical eyepiece holders, you can do fine collimation by steps as follow:

1. unscrew all 6 screws on top on each eyepiece holders (3 on each holder) - their purpose is to lock eyepieces in place
2. put high power eyepieces inside eyepiece holders (dont lock eyepeices yet)
3. look via binoviewer connected to telescope at stars or very distant daytime object
4. shift both eyepieces in same time in all possible directions inside eyepiece holders
5. when you found perfectly merged image, lock eyepeices in place
Finish!

 

WARNING: by rotating eyepiece holders you change collimation position!

Baader Helical eyepiece holder users, CAN combine above mentioned collimation instructions with any of down described collimation methods.

 

 

Carl Zeiss 30mm prisms models who have installed eyepeice holders directly on bino plates, WITHOUT T2 male thread

 

You can easily do collimation by shifting plates which have installed eyepeice holders by steps as follow:

1. unscrew 2 minus screws on binoviewer wing back, on each side
2. slide down each wing side to open binoviewer
3. unscrew all screws which connect binobody and plates with installed eyepiece holders (3 screws on each side), JUST A TINY BIT, approx 1mm +/- that you can shift each plate in all directions
4. put high power eyepieces inside holders
5. lock eyepieces inside holders
6. look via binoviewer connected to telescope at stars or very distant daytime object
7. shift both holders (left and right) in all possible directions
8. when you found perfectly merged image, lock eyepeices in place
Finish!

 

 

Carl Zeiss and Leica models who have installed eyepeice holders directly on bino plates, WITHOUT T2 male thread

 

You can easily do collimation by shifting plates which have installed eyepeice holders by steps as follow:

 

1. rotate/put eyepiece holders bit higher in position
2. unscrew screws on both sides which connect binobody and eyepiece holders with installed plates, JUST A TINY BIT, approx 1mm +/- that you can shift plates in all directions
3. put high power eyepieces inside holders
4. lock eyepieces inside holders
5. look via binoviewer connected to telescope at stars or very distant daytime object
6. shift both holders (left and right) in all possible directions
7. when you found perfectly merged image, lock eyepeices in place
Finish!

 

 

Carl Zeiss and Leica models who use plates with T2 male thread on each eyepiece side

 

You can easily do collimation by shifting whole T2 plates which connect binobody and eyepiece holders by steps as follow:

 

1. unscrew eyepiece holders (if they are on)
2. you will see 3-4 screws (depending on model) on each eyepiece side
3. unscrew all screws which connect binobody and T2 plates, JUST A TINY BIT, approx 1mm +/- that you can shift each T2 plate in all directions
4. screws eyepiece holders back
5. put high power eyepieces inside holders
6. lock eyepieces inside holders
7. look via binoviewer connected to telescope at stars or very distant daytime object
8. shift both holders (left and right) in all possible directions
9. when you found perfectly merged image, lock eyepeices in place
Finish!

 

 

BINOVIEWERS STORING

 

Store binoviewer in moisture free environment.

 

 

CLEANING PRISMS INSIDE BINOVIEWERS

 

Use air blower ONLY after each observing to remove dust fallen on each prism surface (each eyepiece side prism, and telescope side prism).
After 1-2 years of usage, if necessary, use LensPen MiniPro or simillar tool/tools for clean each eyepiece side prism, and telescope side prism.
Dont bother if there is some dirt, dust etc inside binoviewer, there are usually 10 prism flat surfaces where dirt, dust etc can lay on. That wont affect any image performance.

 

Kind regards and all best
Clear Skies
Denis Levatić, binoviewers expert


Edited by denis0007dl, 01 November 2018 - 10:55 AM.

 

#578 Jeff B

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Posted 01 November 2018 - 02:29 PM

Thanks for this very valuable information Denis.

 

Jeff


 

#579 denis0007dl

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Posted 01 November 2018 - 02:41 PM

You are welcome Jeff!

I know it will means all of you a LOT!!!
 

#580 denis0007dl

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Posted 02 November 2018 - 08:43 AM

TeleVue BinoVue replaced original eyepeice holders, and added custom made T2 adapters.

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  • IMG_20181102_142804-780x1040.jpg

Edited by denis0007dl, 02 November 2018 - 08:44 AM.

 

#581 denis0007dl

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Posted 02 November 2018 - 08:43 AM

...and added Baader ClickLock holders...

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  • IMG_20181102_142928-780x1040.jpg

 

#582 wcw

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Posted 02 November 2018 - 09:56 AM

Denis, do the custom adapters + Baader clicklocks shorten the optical length of the Televue Binoviewer? Are you selling the adapters to customers willing to do the modification themselves, and if so how much are the adapters?

 

-Bill


Edited by wcw, 02 November 2018 - 10:11 AM.

 

#583 denis0007dl

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Posted 02 November 2018 - 10:18 AM

Hi Bill,

 

yes, even screwed on Baader ClickLocks save HUGE 7mm of light path vs original eyepiece holders of BinoVue!

And these adapters screwed on actually provide shortest possible light path
https://www.teleskop...--T2-Clamp.html

Yes, end user can do modification/replacement by themselves, with adding some replacement instructions I can provide.

Price for each plate is 120 euros. Its very complex design.


Edited by denis0007dl, 02 November 2018 - 10:23 AM.

 

#584 Jeff B

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Posted 02 November 2018 - 01:59 PM

Hi Bill,

 

yes, even screwed on Baader ClickLocks save HUGE 7mm of light path vs original eyepiece holders of BinoVue!

And these adapters screwed on actually provide shortest possible light path
https://www.teleskop...--T2-Clamp.html

Yes, end user can do modification/replacement by themselves, with adding some replacement instructions I can provide.

Price for each plate is 120 euros. Its very complex design.

German complicated.  wink.gif


 

#585 slavicek

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Posted 03 November 2018 - 06:50 PM

Denis, do the custom adapters + Baader clicklocks shorten the optical length of the Televue Binoviewer? 

 

-Bill

That's why I ask Denis to custom build those adapters for me. Now I will not have to use the binoviewer with the corrector (OCA) on my TAK (!), which means wider FOV, less glass in light path, less weight... Should there be an interest I will write a review. Also, I cannot wait to show this improved binoviewer to uncle Al (Nagler) at next year's NEAF.


 

#586 koprol

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Posted 05 November 2018 - 03:42 PM

I read this whole topic. What a ton of usefull information. Thanks!

 

 

Recently I looked through a binoviewer on a star party. I knew I shouldn't have done that because now I want one too!

 

 

So what I gather from this topic is that the TS prism bino (not the new mirror thingy) is mechanicaly identical is to the Chinese siblings (William Optics, Omegon, Lacerta etc.) but the selfcentering eyepiece holders are better than the others. Right?

 

 

I have a Orion Optics UK 200mm (8") f4.5 Newton telescope. I can use a bino but I have to use a barlow to get into focus? Or is it as simple as removing an extention tube on the focusser? (No idea how this is really called but is is a 2" tube between the 2" tube on the focusser side and the eyepiece holder)

 

 

I have a William Optics 20mm 72 degree swan eyepiece which I like. Is that a suitable eyepiece to get another one of?

 

 

Last I bought a Baader RCC I coma corrector on a whim. Is this usefull for use with a binoviewer?

https://www.baader-p...-corrector.html


 

#587 rcg

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Posted 26 December 2018 - 11:46 PM

Harry Seibert has upgraded his bino line, for instance his excelon 40VP now has a bottom clear arpeture of 40mm and a final aperture of 33mm for 2" eyepieces, but another factor important for viewing is image brightness effected by the fully illuminated spot area here is a table showing the Seibert figures mmhttp://www.siebertop...omparison.html 


 

#588 junomike

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Posted 27 December 2018 - 07:46 PM

Broken Link! (I'm assuming it's this one)


 

#589 rcg

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Posted 28 December 2018 - 12:59 AM

That's it Mike, thanks.


 

#590 Miranda2525

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Posted 17 January 2019 - 10:12 PM

Even my old Burgess binoviewers have a 22mm clear aperture, determined by the flashlight test.

 

Mike

How did you perform the test?  i know how to do it with binoculars, but not binoviewers!

 

Thanks.


 

#591 junomike

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Posted 18 January 2019 - 01:05 PM

No need for a test IMO as It's the housing that usually determines the clear aperture.

Here's a list of some BV's and their CA

 

Having had my WO's and TV's at the same time and trying various pairs in both I agree with Ed's assessment in that a Field Stop of 21mm - 22mm is acceptable,


 

#592 denis0007dl

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Posted 19 January 2019 - 05:01 AM

I have strong fetish to old high quality built stuffs, and I had opportunity to have in hands old Wetzlar binoheads.

Right one is VERY old, and actually impossible to find, especially not in such excellent shape.

Let one is very old as well, but not so much as another.

 

Both very robust and high quality mechanics design.

I wish nowdays binoviewers are made with such precision, robustness, and such high quality and smoothness of mechanics.

 

Lets record that beauties forever with some specifications never recorded.

 

Here is shown up look.

Attached Thumbnails

  • IMG_20190119_104801-1209x1612.jpg

Edited by denis0007dl, 19 January 2019 - 05:02 AM.

 

#593 denis0007dl

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Posted 19 January 2019 - 05:08 AM

Here is bottom look, where we can see angled built in prisms.

 

Left one have clear aperture 12mm only, and absolutely non coated prisms.

Optics without fungus and without any issues in cemented beamsplitter (suprise).

Weight 750 grams.

Light transmittion is actually suprisingly very high, which was not be be expected.

Its much higher than his brother on right, which have some nice prism coatings.

 

Right bino have clear aperture 16mm, and all prisms have very nice prism coatings as shown on photo.

Coatings can be very easily removed even by gentile cleaning.

Some imperfections presented in cemented beamsplitter.

Weight 740 grams.

Attached Thumbnails

  • IMG_20190119_104915-1209x1612.jpg

Edited by denis0007dl, 19 January 2019 - 05:10 AM.

 

#594 denis0007dl

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Posted 19 January 2019 - 05:09 AM

Here is shown interior with very nice prism built and mechanics.

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  • IMG_20190119_103923-1209x1612.jpg

Edited by denis0007dl, 19 January 2019 - 05:11 AM.

 

#595 denis0007dl

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Posted 19 January 2019 - 05:13 AM

...and here is comparation with angled Carl Zeiss which is my favorite angled binoviewer af all times.

Top shown....

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  • IMG_20190119_104824-1209x1612.jpg

 

#596 denis0007dl

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Posted 19 January 2019 - 05:20 AM

...and bottom...

For comparation, Zeiss have clear aperture 18.5mm, MgF2 coatings, and produce brightest images of all.

Weight 850 grams.

 

Just to mention/add: all of them produce super sharp images, with high contrast, and have very very low scattered light!

As we sayed earlier, all of them have incredible strong and smooth working mechanics, so Germany have huge + in binoviewers making smile.gif

 

Now we have all these usefull datas and photos in one place, in just one thread.

Hope some of these datas will be usefull for future readers.

 

All best,

Denis, binoviewers expert

Attached Thumbnails

  • IMG_20190119_105016-1612x1209.jpg

Edited by denis0007dl, 19 January 2019 - 05:24 AM.

 

#597 Jeff B

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Posted 19 January 2019 - 12:09 PM

Very cool stuff Denis.

 

What are the optical path lengths of each one?

 

Jeff


 

#598 denis0007dl

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Posted 19 January 2019 - 12:42 PM

Didnt measure exactly, and all depends what custom made adapters are used, and if there are T2 eyepiece plates and holders, light path differs a lot.

Usually angled Zeiss with custom made T2 plates and added ClickLock eyepiece holders, have approx 11cm only of light path.
Why I say only, is because it have built in angled prism.
 

#599 Miranda2525

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Posted 19 January 2019 - 11:50 PM

No need for a test IMO as It's the housing that usually determines the clear aperture.

Here's a list of some BV's and their CA

 

Having had my WO's and TV's at the same time and trying various pairs in both I agree with Ed's assessment in that a Field Stop of 21mm - 22mm is acceptable,

Only reason I asked was because I was told about a week or two ago that the oder WO Binoviewers had a clear aperture of 17mm as opposed to 21-22mm like they have now.


Edited by Miranda2525, 20 January 2019 - 01:45 AM.

 

#600 denis0007dl

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Posted 18 February 2019 - 02:16 PM

Showed beamsplitter from Leica BIG binoviewer with 28mm prisms.

Check out that beautifull modern coatings, and how Leica make "baffling" on each prism surface leaving pure circle where light passing through.

Attached Thumbnails

  • Leica 2.jpg

Edited by denis0007dl, 18 February 2019 - 02:17 PM.

 


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