TheSkySearchers

Hello to all ,
I would like to do binoviewing with a televue 85 .
Which one? And is there anything I should know?
thanks .

Binoviewing is tricky. I've settled on Baader products for that although there are other fine product lines. I used the Mark V for a long time but downsized to the Maxbright.

The main trick is to assure that you have enough focus travel to accommodate the optical path. Also since the TeleVue 85 is relatively fast you may need a compensator to remove spurious color and take care of any deficiencies in focus travel. Some folks use barlows for the latter. I use the Baader glass path compensators.

some have already said that it was tricky also with the vision of things.

messier 111 wrote: ↑Wed Nov 24, 2021 9:29 pm some have already said that it was tricky also with the vision of things.

As long as the inter pupillary distance of your eyes is within the range the binoviewer accommodates that's the first issue. If you already manage binoculars well there should be no other problems.

Do binoviewers produce/show a 3D effect like binoculars do?

Someone told me that it was even better, because of the magnification.
It's like looking into giant binos.
like the apm 100mm ed.
I personally have no idea.
I haven't had a chance to try it yet.

I’ve done the bino viewing on scopes as large is 22 inches. It is an amazing experience it’s like you get sucked right into outer space.

I got into binoviewing earlier this year. Wanted to get Baader binoviewers but they are permanently out of stock. I went with very basic Orion BVs and they work nicely in my refractors. Several vendors sell rebrands of the same unit. To reach focus with these basic BVs in refractors you need to use barlow nose piece. It increases focal ratio of the scope so you need to use longer FL EPs. My favorites are pairs of Meade 32mm and 26mm Plossls, but I have used EP pairs down to ~10mm. DSOs and doubles look dark in BVs, but the Moon is stunning. From what I hear planets looks nice to, but I am generally heaving inferior views of planets this year, so can't judge yet.

https://www.telescope.com/Orion/Orion-B ... binoviewer

Refractordude wrote: ↑Wed Nov 24, 2021 10:19 pm Do binoviewers produce/show a 3D effect like binoculars do?

On Moon you do see 3D, the rest of space looks flat.

messier 111 wrote: ↑Wed Nov 24, 2021 8:21 pm Hello to all ,
I would like to do binoviewing with a televue 85 .
Which one? And is there anything I should know?
thanks .

If your plan is to use 24mm Panotics or 32mm Plossls or any eyepiece that maxes out the field stop of a 1.25" eyepiece (approx 27mm), then you want to make sure that the binoviewer you select has a clear aperture of at least 25mm. Anything much less and you will see vignetting. Of course, this assumes you are not using an OCA or GPC with the binoviewer. Not many telescopes can binoview without an OCA/GPC/Barlow since there is not enough backfocus to handle the extra light path of the binoviewer. Backfocus on a TV85 is I believe about 150mm and typically I find that 175-180mm is needed to binoview without an OCA. So the Barlow or OCA/GPC extends the light cone so the binoviewer can come to focus. With your TV 85 you will need to use an OCA/GPC from all that I have read from others. So expect that you will need at least a 2x OCA/GPC to come to focus meaning something like a 24mm wide field or 32mm Plossl will give you 52 or 68x as your minimum magnification and about a 1.3 degree TFOV.

My TSA-102 (230mm backfocus) and APM-152 (175mm backfocus) both are binoviewer friendly so do not need an OCA when binoviewing (APM just barely makes it). I have the Baader MaxBright-II binoviewer and find it quite excellent. I previously had the William Optics binoviewer and it was no where near as ergonomically pleasant plus it vignetted with 32 Plossls or 24 Pans as its clear aperture is only 20mm.

FYI, in case you have not seen these...

app.php/article/field-test-of-the-baade ... binoviewer

app.php/article/field-test-carl-zeiss-a ... binoviewer

thanks to all of you .