• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Astronomic binoviewer fitted to TSN 883/884--possible or no? (2 Viewers)

S

saidentary

Active member
Would it be possible to use an astronomical eyepiece adapter to fit a high quality binocular viewing assembly onto a Kowa TSN-883 or TSN-884?

Has anyone tried this? Or has anyone researched this? (I'm guessing that this is a stupid idea that's totally unworkable for reasons that are obvious to most of this crowd, but I'll ask anyway...)*


*I also posted this question on cloudy nights.
 
Last edited:
Hi,

I have doubts that you will come to focus - binoviewers have quite a bit of optical path which will be more than the rather limited focus travel of the spotting scope can compensate. You could try to experiment with an adjustable barlow to get the focus point out and maybe come to focus.

Not recommended unless you happen to have the stuff on hand already... or s.b. in the astro club has...

Joachim
 
jring said:
Hi,

I have doubts that you will come to focus - binoviewers have quite a bit of optical path which will be more than the rather limited focus travel of the spotting scope can compensate. You could try to experiment with an adjustable barlow to get the focus point out and maybe come to focus.

Not recommended unless you happen to have the stuff on hand already... or s.b. in the astro club has...

Joachim
Click to expand...

Fair enough. Thanks for the information.
 
Your web site is amazing!

|:D|
DRodrigues said:
To adapt: yes. To reach focus: no, unless you are available to see the image completely inverted.
Nowadays you have the alternative Swaro BTX.
You might be interested on having a look at http://www.pt-ducks.com/cr-telescopes.htm#CR-binoviewing
Click to expand...

Your web site {http://www.pt-ducks.com} is astoundingly excellent. What a masterpiece of fine work. Such a web site exemplifies how the internet can be a great place. FWIW, I'm extremely impressed. Wow.....just......WOW.

I guess you could say that you have "all your ducks in a row."|:D|
 
Last edited:
Would this unit suggested in post #6 by AstroBird69 (https://www.apm-telescopes.de/en/op...al-length-complete-correction-of-optical-path) be expected to work if an astro adapter were used with the kowa TSN 883 or TSN 884?

{Its description (on the Telescope Express site) says it has "built-in 100% compensation of the optical path" and that the "Bino extension can be used on all telescopes with 1.25" eyepiece connection, no additional optical path is required." But I'm not sufficiently knowledgeable to determine whether that means it would be expected to work.}
 
Last edited:
saidentary said:
Would this unit suggested in post #6 by AstroBird69 (https://www.apm-telescopes.de/en/op...al-length-complete-correction-of-optical-path) be expected to work if an astro adapter were used with the kowa TSN 883 or TSN 884?
...
Click to expand...
Yes, it probably will reach focus but it's the solution I mention on the previous post as "...To reach focus: no, unless you are available to see the image completely inverted." i.e. up side down and left to right... Additionally the image quality shouldn't be much good - see post 501 and following at https://www.cloudynights.com/topic/511998-review-binoviewers-zeiss-baader-william-optics-siebert-denkmeier/page-21
I found a compact solution to use a refractor with a binoviewer for terrestrial use and straight view, but I'm still waiting for some adapter pieces I ordered... Will update my page when receiving these and will post a BF.
I'm glad my web-page is useful for some of you - it was my idea for doing it...;)
 
Hi David,

could you please explain why you think the image will be inverted with a spotting scope body (including a porro or roof prism based image erection assembly) and a binoviewer?

I fail to see why we should get an inverted image here...

The TS zero path binoviewer mentioned in the CN thread indeed seems to be not so great - the APM version unfortunately looks the same, so it's probably not so great also...

Joachim
 
DRodrigues said:
Yes, it probably will reach focus but it's the solution I mention on the previous post as "...To reach focus: no, unless you are available to see the image completely inverted." i.e. up side down and left to right... Additionally the image quality shouldn't be much good - see post 501 and following at https://www.cloudynights.com/topic/511998-review-binoviewers-zeiss-baader-william-optics-siebert-denkmeier/page-21
I found a compact solution to use a refractor with a binoviewer for terrestrial use and straight view, but I'm still waiting for some adapter pieces I ordered... Will update my page when receiving these and will post a BF.
I'm glad my web-page is useful for some of you - it was my idea for doing it...;)
Click to expand...

jring said:
Hi David,

could you please explain why you think the image will be inverted with a spotting scope body (including a porro or roof prism based image erection assembly) and a binoviewer?

I fail to see why we should get an inverted image here...

The TS zero path binoviewer mentioned in the CN thread indeed seems to be not so great - the APM version unfortunately looks the same, so it's probably not so great also...

Joachim
Click to expand...

Thank you David and Joachim. That's helpful.
 
jring said:
Hi David,

could you please explain why you think the image will be inverted with a spotting scope body (including a porro or roof prism based image erection assembly) and a binoviewer?

I fail to see why we should get an inverted image here...

...
Click to expand...
Hi Joachim,
It's because we are discussing a special binoviewer that has 0 focus distance but also is an erector... So if in a spotting scope the image is already corrected, with this bino it will be inverted...:-C
I have an old low cost binoviewer from Soligor that is also 0 focus distance and an erector, and it focus on my spotting scopes but with inverted image... This Soligor has other optical problems but I tried to use it with the Vixen erector on the Spotting scopes (see http://www.pt-ducks.com/cr-telescopes.htm#Test%20of%20image%20erectors), however the resulting image was no good, besides adding too much length of the combo. Just remembered that I might get a more compact solution but I don't expect better image quality and probably would not work with the TS binoviewer...
 
DRodrigues said:
Hi Joachim,
It's because we are discussing a special binoviewer that has 0 focus distance but also is an erector... So if in a spotting scope the image is already corrected, with this bino it will be inverted...:-C
I have an old low cost binoviewer from Soligor that is also 0 focus distance and an erector, and it focus on my spotting scopes but with inverted image... This Soligor has other optical problems but I tried to use it with the Vixen erector on the Spotting scopes (see http://www.pt-ducks.com/cr-telescopes.htm#Test%20of%20image%20erectors), however the resulting image was no good, besides adding too much length of the combo. Just remembered that I might get a more compact solution but I don't expect better image quality and probably would not work with the TS binoviewer...
Click to expand...

Okay guys, what about this one?

http://www.microglobe.co.uk/barr-an...sierra-20-60x84ed-spotting-scope-p-10937.html

or this one:

https://www.bhphotovideo.com/c/prod..._olbv_us_bino_viewer_for_spotting_scopes.html

This one looks vaguely familiar........

https://www.optics-pro.com/instruments/orion-premium-linear-binoviewer/p,59336
 
The third one is similar to the TS.

The other 2 might work (the second link didn't worked for me but I found https://www.bhphotovideo.com/c/product/1109977-REG/olivon_olbv_us_bino_viewer_for_spotting_scopes.html), but probably only with the included barlows (this second alternative should be the best for you because it has 2 barlows and is from USA store, easier to send back if you don't like). That means that the 32mm eps will be in fact equivalent to 17.3 or 10.7mm that will result on 29x and 47x, with probably <=50º AFOV. Probably only the 3x barlow will work so if 47x with 50º is ok to you, go forward and let us know what you think of it...:-O
I remember exchanging e-mails with Olivon Europe about this binov but give-up after noticing that couldn't exchange eps and would be limited to 50º AFOV and high mags...
 
Hi David, hi Bill,

regarding the inverted image question, ok I had not seen any notice of image erection in the APM binoviewer ad - and I searched for it. If it does erection and the Kowa body does, this is obviously one time too much and we'll get an inverted image. But since the optical quality seems not so great, it's a moot point.

If Bill is dread set on getting binoviewing with his Kowa, I strongly recommend to talk to Harry Siebert of Siebert Optics about options. He probably can make you an optical path corrector to adapt any good Binviewer to your Kowa.

Joachim
 
The TS has a limited size field stop (?17mm), so you can’t put long ultrawide ep in it,
I read the Orion US manual and they list image orientation with diagonal type,
Seem to be suggesting a pentaprism one to get the right giewnon a normal refractor. I might just try a normal cheap binoviewer (eg WO) in my 66mm scope, accepting the 1.6x optical corrector needed to pull the focus out,
They come with wideish 20mm ep (though have about 21mm field stop limitations, so still no ideal solution to long focal length, ultrawide views unless the hacksaw comes out!

I’d just like to extend the >70degree views I enjoy in my binoculars to higher magnification without having to carry too much weight around.

Peter
 
Warning! This thread is more than 5 years ago old.
It's likely that no further discussion is required, in which case we recommend starting a new thread. If however you feel your response is required you can still do so.

Similar threads

G
Using KOWA TSN-EX16S (1.6x) Extender with a TSN-823?
Replies
5
Views
876
Grando
G
B
Observing the Moon with a spotting scope
Replies
8
Views
676
dries1
dries1
C
Manfrotto 190GOA4 + 128RC compatibility with Kowa 883, plus backpack/transport question
2
Replies
25
Views
2K
Chris C
C
M
Digiscoping with Kowa 883
2
Replies
35
Views
13K
Hav
Hav
binomania
The new Kowa TSN-883 has arrived (for my review)
Replies
4
Views
3K
Jefrs
J

Users who are viewing this thread

Total: 3 (members: 0, guests: 3)
Back
Top