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Binoviewer for big fast Dob
Posted: Mon Nov 11, 2019 1:26 am
by Kingofthehill
Hi Everyone,
I am considering a binoviewer, mostly used with the scope I use most often, my 18UC. There have been multiple binoviewer threads in this forum and its predecessor, however I see the binoviewer being used mostly with refractors, not on Dobs. My major concern is my Interpupillary distance (IPD), 77 mm. I tried a binoviewer last year at a star party. The IPD was not adjustable enough to fit me. Not all manufacturers list the IPD in the specifications area of their units. There used to be a telescope shop within two hours of me, sadly, it is now Internet only sales, without a sales floor, so no test-before-I-buy option. I called Televue and asked what the IPD of theirs was, they didn't know. At least the person I was talking to couldn't find the answer.
Anyone out there, with a binoviewer, and eyes that are across the room from each other?
Re: Binoviewer for big fast Dob
Posted: Mon Nov 11, 2019 3:40 am
by notFritzArgelander
I've owned and used the Baader Maxbright and Mark V units and they max out at ~75mm so I can barely use them since I'm at 73mm.
Re: Binoviewer for big fast Dob
Posted: Mon Nov 11, 2019 5:27 am
by Kingofthehill
notFritzArgelander wrote: ↑Mon Nov 11, 2019 3:40 am
I've owned and used the Baader Maxbright and Mark V units and they max out at ~75mm so I can barely use them since I'm at 73mm.
Obvious discrimination. When will the cranially endowed not be abused?
Re: Binoviewer for big fast Dob
Posted: Mon Nov 11, 2019 5:40 am
by Lady Fraktor
Siebert Optics 2" BV IPD is 55mm-82mm though they are not inexpensive.
Re: Binoviewer for big fast Dob
Posted: Mon Nov 11, 2019 8:38 pm
by Kingofthehill
Lady Fraktor wrote: ↑Mon Nov 11, 2019 5:40 am
Siebert Optics 2" BV IPD is 55mm-82mm though they are not inexpensive.
They certainly aren't.
Re: Binoviewer for big fast Dob
Posted: Tue Nov 12, 2019 11:17 pm
by helicon
I wanted a binoviewer when I had my 18" - but then I sold the scope. My plan is to get one when I buy my next large Dob, but that won't be until I relocate to dark skies (about 3-5 years away at this point).
Re: Binoviewer for big fast Dob
Posted: Wed Nov 13, 2019 4:39 am
by notFritzArgelander
Kingofthehill wrote: ↑Mon Nov 11, 2019 5:27 am
notFritzArgelander wrote: ↑Mon Nov 11, 2019 3:40 am
I've owned and used the Baader Maxbright and Mark V units and they max out at ~75mm so I can barely use them since I'm at 73mm.
Obvious discrimination. When will the cranially endowed not be abused?
Never. As long as the cranially unendowed are the "in" crowd in high school and adult politics, we're doomed.
Re: Binoviewer for big fast Dob
Posted: Wed Nov 27, 2019 10:26 pm
by Rainmaker
Just a thought on the use of binoviewers with fast scopes.......
due to the broad light cone on faster Newts (like my F3,5) there can be quite severe vignetting at the binoviewer which are mostly designed for the quite narrow light cones of scopes from F5 to F15 etc....
Re: Binoviewer for big fast Dob
Posted: Sun Feb 16, 2020 11:32 am
by denis0007dl
Kingofthehill wrote: ↑Mon Nov 11, 2019 1:26 am
Hi Everyone,
I am considering a binoviewer, mostly used with the scope I use most often, my 18UC. There have been multiple binoviewer threads in this forum and its predecessor, however I see the binoviewer being used mostly with refractors, not on Dobs. My major concern is my Interpupillary distance (IPD), 77 mm. I tried a binoviewer last year at a star party. The IPD was not adjustable enough to fit me. Not all manufacturers list the IPD in the specifications area of their units. There used to be a telescope shop within two hours of me, sadly, it is now Internet only sales, without a sales floor, so no test-before-I-buy option. I called Televue and asked what the IPD of theirs was, they didn't know. At least the person I was talking to couldn't find the answer.
Anyone out there, with a binoviewer, and eyes that are across the room from each other?
Hello Paul,
firstly, TeleVue BinoVue have IPD tange from 55-75mm max.
In 1.25" format, there are only 2 binoviewers with IPD 77mm, and are made by Carl Zeiss.
Here is one model
https://www.cloudynights.com/classified ... ewer-ever/
and here is second
https://www.cloudynights.com/classified ... inoviewer/
Hope it helps.
Kind regards
Denis