Return to the Cloudy Nights Telescope Reviews home page


Telescope Specific Forums >> Questar Forum

Pages: 1 | 2 | (show all)
astro_que
sage
*****

Reged: 11/11/09

The Questar 12
      #3761792 - 04/22/10 04:27 PM

At NEAF, the owner of the company spontaneously expressed his desire to build new 12"'s, with the same thermal innovations as the Titanium 7.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Steve C.
sage


Reged: 01/24/08

Loc: Sugar Land, TX
Re: The Questar 12 new [Re: astro_que]
      #3761871 - 04/22/10 05:07 PM

Gawd, what would something like that cost?

They would definitely need some new engineering for equalization.


Post Extras: Print Post   Remind Me!   Notify Moderator  
greedyshark
professor emeritus
*****

Reged: 10/31/05

Loc: 3rd Rock
Re: The Questar 12 new [Re: Steve C.]
      #3761895 - 04/22/10 05:17 PM

Quote:

They would definitely need some new engineering for equalization.




...and I would definately need another source of income to afford.

CS,
Charles


Post Extras: Print Post   Remind Me!   Notify Moderator  
astro_que
sage
*****

Reged: 11/11/09

Re: The Questar 12 new [Re: greedyshark]
      #3761967 - 04/22/10 06:01 PM

They now believe they have the thermal technology to build any size Mak. It just takes a lot of titanium and fancy machining.

Post Extras: Print Post   Remind Me!   Notify Moderator  
ColoHank
Carpal Tunnel
*****

Reged: 06/07/07

Loc: western Colorado
Re: The Questar 12 new [Re: astro_que]
      #3762661 - 04/22/10 11:52 PM

It takes a big, thick hunk of glass and a lot of grinding to produce the deeply curved corrector for a 12-inch Mak. Hang on to your wallets!

Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnH
Carpal Tunnel
****

Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: The Questar 12 new [Re: ColoHank]
      #3796506 - 05/10/10 12:05 AM Attachment (274 downloads)

As an owner of an original 11 1/4" Hayward BSC-2 glass blank made in the late 50's, I can testify that the obstacles to overcome require a bit more than titanium. Even back then, this piece of glass was some $300, which could have bought a good used car then.

The front corrector on the 12 is some 1 1/2" thick, with deep curves. The only ways to make one is to start with a solid piece of optical glass and generate the deep curves on both sides or slump mold a suitable piece and then anneal it. The latter has the problem of rejects due to a poor anneal, resulting is a high percentage of loss. The former requires a glass blank that is around 2 1/2" by 13" in diameter.

Having looked through one on several different nights, I can also attest to the need for thermal reconciliation to get the best use of one.

This size pushes the limits of practicality on the design. My own design using the 11 1/4" corrector blank suggests the lower limit of weight is around 45 lbs, assuming an aluminum tube machined down, an open cell to reduce weight and to help cool the mirror.


Post Extras: Print Post   Remind Me!   Notify Moderator  
saemark30
Pooh-Bah


Reged: 02/21/12

Re: The Questar 12 new [Re: JohnH]
      #5193589 - 04/27/12 03:17 PM

Anything more about this Q12?
I sure like to see something like like, even ATM made.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Steve's 50th
member


Reged: 07/30/11

Re: The Questar 12 new [Re: saemark30]
      #5194676 - 04/28/12 10:51 AM

I would think that the demand for a Q-12 would be very limited, to the point where it is not practical for Questar to attempt to make them. If I remember correctly, back when they tried to promote them they sold less than a dozen? I think there are just too many other designs that can produce the same results at a far lower cost. I'd love to own one but will never be able to due to the cost.

Post Extras: Print Post   Remind Me!   Notify Moderator  
GeneT
Ely Kid
*****

Reged: 11/07/08

Loc: South Texas
Re: The Questar 12 new [Re: ColoHank]
      #5268650 - 06/12/12 07:51 PM

Quote:

It takes a big, thick hunk of glass and a lot of grinding to produce the deeply curved corrector for a 12-inch Mak. Hang on to your wallets!




It would also be quite heavy.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Billydee
professor emeritus
*****

Reged: 01/23/08

Loc: Winter Haven, FL
Re: The Questar 12 new [Re: GeneT]
      #5268788 - 06/12/12 09:45 PM

I think that they are developing one for a government contract. I would expect it to be in the $250,000 to $500,000 range.

Bill


Post Extras: Print Post   Remind Me!   Notify Moderator  
Erik Bakker
Post Laureate
*****

Reged: 08/10/06

Loc: The Netherlands, Europe
Re: The Questar 12 new [Re: Billydee]
      #5268997 - 06/13/12 03:20 AM

Quote:

I think that they are developing one for a government contract. I would expect it to be in the $250,000 to $500,000 range.

Bill




In that case, I'd start searching for an A-P 10" Mak or have Matthias Wirth build a 12" MCT for you. Nostalgia apart, you would end up with a more enjoyable and of course affordable scope.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Bill Boublitz
super member


Reged: 05/04/13

Re: The Questar 12 new [Re: Erik Bakker]
      #5855331 - 05/12/13 11:55 AM

For a time Company 7 had listed the 12" as under development. It's since been removed.

During one visit to the Questar facility, I asked Jim Richert about the 12". He said they were slowly working it out. Since their primary income source are government contracts, they only fool with it when they have time. Of the prototypes, he stated they have more work to reduce weight and cost but added, "I could sell forty of these right now, sight unseen. We'll get there."

Makes you wonder, doesn't it?


Post Extras: Print Post   Remind Me!   Notify Moderator  
dawziecat
Carpal Tunnel
*****

Reged: 10/20/10

Loc: Rural Nova Scotia
Re: The Questar 12 new [Re: Steve's 50th]
      #5884065 - 05/25/13 02:13 PM

Quote:

If I remember correctly, back when they tried to promote them they sold less than a dozen?




Less than a dozen? Wow!
I saw one, "in the flesh," so to speak. Was driving through New Hope, quite by accident and stopped when I saw the Questar buildings. There was a yellow 12" OTA just lying on the carpet. The year? About 1981.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Michael Lomb
super member


Reged: 10/26/10

Loc: North Island New Zealand
Re: The Questar 12 new [Re: dawziecat]
      #5886379 - 05/26/13 11:36 PM

In case anyone is interested, here is a post from another site from someone who had observing time with a Questar 12 and wrote up about his experience.

http://adsabs.harvard.edu/full/1986JRASC..80L..15M


Post Extras: Print Post   Remind Me!   Notify Moderator  
Bob Myler
Carpal Tunnel
*****

Reged: 05/18/06

Loc: St Louis, MO
Re: The Questar 12 new [Re: Michael Lomb]
      #5886738 - 05/27/13 09:39 AM

It appears that they didn't have much to say...

Post Extras: Print Post   Remind Me!   Notify Moderator  
mdowns
Carpal Tunnel
*****

Reged: 06/12/10

Loc: Englewood,FL
Re: The Questar 12 new [Re: Bob Myler]
      #5887309 - 05/27/13 03:16 PM

Actually he did. You need to advance to the next page.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Bob Myler
Carpal Tunnel
*****

Reged: 05/18/06

Loc: St Louis, MO
Re: The Questar 12 new [Re: mdowns]
      #5888044 - 05/27/13 10:43 PM

Ooops! My bad.

Thanks.


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnH
Carpal Tunnel
****

Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: The Questar 12 new [Re: Bob Myler]
      #5895788 - 06/01/13 10:44 AM

The Q12 to my knowledge they made 16 or so of these, all on a massive GEM made by Edward Byers, who's name in gear making is legend.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: The Questar 12 new [Re: JohnH]
      #5899748 - 06/03/13 01:54 PM

The thermal management is a good question for this. I'd imagine at that price point you might assume the observer would have a dry nitrogen purge available.

-Rich


Post Extras: Print Post   Remind Me!   Notify Moderator  
orion61

*****

Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: The Questar 12 new [Re: Starhawk]
      #5900611 - 06/03/13 09:31 PM

I want a Space Shuttle too ..but..
That is just too big to be practical.
I would say 9 or 10" would be more like it.
Apples and Oranges, but I saw detail through a 12" Cave Astrola with reported 10th wave optics I never would have believed possible, it made another members C11 look like "viewing through a dirty window" Simply amazing.
I'd sure love a chance at a Moonless night with Mars at Opposition and Uranus visable. I am one of those guys who seriously study the outer Twins, With ex optics and outstanding seeing conditions there are details to see.
I have 20/15 +2 vision so I was lucky in that department.
Has there been a decision of the 12" Color scheme?
will it be the Yellow prototype I saw?
I'm betting only sub 1% of us in population would spend the money for that instead of other things..
You would need to put it in your Will.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | (show all)


Extra information
0 registered and 2 anonymous users are browsing this forum.

Moderator:  cbwerner, Brian Risley 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 7936

Jump to

CN Forums Home




Cloudy Nights Sponsor: Astronomics