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Equipment Discussions >> Reflectors

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smallscopefanLeo
sage
*****

Reged: 01/23/11

I'd love a 36" Fullum "Techno-Fusion" sandwich! new
      #5715830 - 03/06/13 04:26 AM

There is one on A-mart now, 25k. Just amazing the technology that is available for amateurs to wield nowadays.

Could anyone 50-60 years ago ever imagine these sorts of mirrors being available commercially? Or 30-40 years ago? Just mind boggling!

If I was to win the lotto, I would immediately make the call to give them a heads up that I would soon be putting money down on a meter-plus sized one, and start planning a home built around a massive observatory centerpiece with a special computerized balcony/catwalk that tracks together with the scope, raising alongside and revolving around it, before even purchasing any land yet (I would also have a dedicated wing with a Zeiss planetarium, of course!)... hey, it's free to dream!


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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: smallscopefanLeo]
      #5715896 - 03/06/13 07:09 AM

But your forum username is smallscopefan???

I'm sure I'll do the same thing when I win the lottery.

I've already got the land.


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smallscopefanLeo
sage
*****

Reged: 01/23/11

Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: nirvanix]
      #5716123 - 03/06/13 10:20 AM

Quote:

But your forum username is smallscopefan???

I'm sure I'll do the same thing when I win the lottery.

I've already got the land.




Oh I may observe small, but I sure do dream big

(and hey, let us not think for a microsec that I won't be adding Telementors, Questars, Teleports (and 5" D&G and Portaballs and ..) to my collection as well, should riches be struck! )


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cjc
sage


Reged: 10/15/10

Loc: Derbyshire, England
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: smallscopefanLeo]
      #5716292 - 03/06/13 12:24 PM

No what you really need is one of these!

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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: smallscopefanLeo]
      #5716313 - 03/06/13 12:39 PM

and at 120lbs for a 1:6 ratio...

36 blank at NEAF

if you like it, give it a thumbs up...


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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: cjc]
      #5716514 - 03/06/13 02:16 PM

The Extremely Large Telescope?

Bah, a mere piker.

There is already a proposal for OLT: The Overwhelmingly Large Telescope:
http://en.wikipedia.org/wiki/Overwhelmingly_Large_Telescope

The logical next step must be ILT: The Insanely Large Telescope.


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Starman1
Vendor (EyepiecesEtc.com)
*****

Reged: 06/24/03

Loc: Los Angeles
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: careysub]
      #5717002 - 03/06/13 06:22 PM

That scope has a projected focal length of 175,000mm.
Let's see, that yields a true field, using a 56mm Plossl, of 0.9 arc-minute.
And a magnification of 3125X
Nope, not workable.
Now a 10" diameter eyepiece of 500mm focal length yields a true field of 4.9' and a magnification of 350X
Nope, that doesn't work either.
How about a 20" diameter eyepiece of 1000mm focal length?
175X with a true field of 9.8'
Still a no go.

Face it, some telescopes would just be too big, no matter how much aperture fever you have.


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steveyo
super member


Reged: 03/13/12

Loc: Upstate NY
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: Starman1]
      #5717012 - 03/06/13 06:28 PM

I'm pretty sure those scope just mentioned would require you to win several lotteries, not just one.

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Sgt
Pooh-Bah
*****

Reged: 12/17/05

Loc: Under the southern horn of the...
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! [Re: steveyo]
      #5717045 - 03/06/13 06:46 PM

The OWL went the same was as the 50inch Orion/Fullum dobs. In other words, you don't need to win any lotteries!

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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: Starman1]
      #5718934 - 03/07/13 05:46 PM

This raises the interesting question of what the size limits for a usable visual scope are. Care to offer a judgment?

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Dick Jacobson
scholastic sledgehammer


Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: Starman1]
      #5720047 - 03/08/13 08:52 AM

Quote:

Now a 10" diameter eyepiece of 500mm focal length yields a true field of 4.9' and a magnification of 350X
Nope, that doesn't work either.
How about a 20" diameter eyepiece of 1000mm focal length?
175X with a true field of 9.8'
Still a no go.



But you could look into the eyepieces with both eyes. Maybe two people could share the view.


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Dick Jacobson
scholastic sledgehammer


Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: I'd love a 36" Fullum "Techno-Fusion" sandwich! new [Re: careysub]
      #5720057 - 03/08/13 09:00 AM

Quote:

This raises the interesting question of what the size limits for a usable visual scope are. Care to offer a judgment?



I think the Mike Clements 70" reflector has hit the limit (see 70" scope). For my 5 mm pupils, the lowest magnification that would capture all the light is about 350x. The highest magnification that I usually use, given the limitations imposed by the atmosphere, is...350x. So I would only need one eyepiece if I had that scope!


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