Why no binocular SCTs?

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AntennaGuy
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Why no binocular SCTs?

#1

Post by AntennaGuy »

OK, here's a simple (to ask) question:
There exist all sorts of binoculars, astronomy binoculars, and even binocular telescopes, priced low to high. They can even become quite large, such as the ones offered by TEC:
https://www.telescopengineering.com/tel ... elescopes/
or by APM:
https://skygazeoptics.com/products/apm- ... gJbYfD_BwE
or Fujinon:
https://www.bhphotovideo.com/c/product/ ... gK-lfD_BwE
And there are even some binocular Dobsonians!
http://www.lotsofbow.com/bino.html
But I haven't seen or heard of even one Cassegrain-type binocular telescope,whether SCT, classical, Maksutov, or other! Why not? Am I just looking in the wrong places? There certainly exist small SCTs that are as compact as the single-sides of the large binoculars noted above. And some of them don't even cost a lot (e.g., Celestron's 6" regular SCTs) and they are rather compact, lengthwise. So... why wouldn't someone, perhaps with a flare for novelty, build binoculars (and I don't mean just add binoviewers) out of these?
:shrug: :shrug:

p.s. Is it all about central obstruction issues at low powers? But high power use would still be ok, right? Hmm. Maybe alignment becomes too difficult then... But still, none ever?
* Meade 323 refractor on a manual equatorial mount.
* Celestron C6 SCT on a Twilight 1 Alt-Az mount
* Losmandy GM8G mount.
* Vixen VMC260L on order.
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AntennaGuy
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Re: Why no binocular SCTs?

#2

Post by AntennaGuy »

Well, never say never! Since that last post, I just found this one:
https://astromart.com/classifieds/astro ... -telescope
* Meade 323 refractor on a manual equatorial mount.
* Celestron C6 SCT on a Twilight 1 Alt-Az mount
* Losmandy GM8G mount.
* Vixen VMC260L on order.
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Re: Why no binocular SCTs?

#3

Post by JayTee »

I'd rather use one eye for just $680 versus both eyes at $6800! And those are 2013 dollars!

JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
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I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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Bigzmey
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Re: Why no binocular SCTs?

#4

Post by Bigzmey »

In the smaller sizes up to 100mm, binoculars based on catadioptric design will be in disadvantage compared to refractors in terms of performance and cost.

For the larger apertures, compact size, smaller weight and lack of CA of SCT design in particular could be advantageous for binocular scope builders. Used 6-8" SCT are plenty and relatively inexpensive. If I would be in to larger binocular scopes I would give it a shot. :)
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2005 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1565, S110: 77). Doubles: 1382, Comets: 18, Asteroids: 88
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helicon
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Re: Why no binocular SCTs?

#5

Post by helicon »

Sounds like it would be feasible in the medium to large aperture range.
-Michael
Various scopes, 10" Zhumell Dob, ES AR152, AWB 5.1" Onesky newt, Oberwerk 25x100 binos, two eyeballs
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DeanD
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Re: Why no binocular SCTs?

#6

Post by DeanD »

They would be feasible, but I am not sure about how useful they would be with the large focal ratios of Maks and SCTs.
Telescopes: 12" f5 dob, Celestron CPC800, 150mmf5 Celestron achro, Tak TSA102, TV76, ETX125...
Binos: Tak 22x60, Swarovski 8x30 Habicht, FB 25x100, Orion Regulux 15x70...
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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Sky
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Re: Why no binocular SCTs?

#7

Post by Sky »

I've always found this patent for SCT binoculars on a 3-axis equatorial mount very interesting. I've been tempted to build the 3-axis mount for my own ... much smaller ... binoculars. Maybe, one of these days ...

https://www.freepatentsonline.com/5537250.pdf
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