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Equipment Discussions >> Cats & Casses

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Inside Questar
      #5549953 - 12/02/12 09:03 AM Attachment (467 downloads)

Remember those old early '80's Questar adds that had a pic of a Questar that was cut in half? Well I'm fairly sure that we have had that very Questar on display at the Cernan Space Center for over 22 years. Recently I had the task of cleaning it up and decided to to take a few close up pics and thought it would be cool to show them here....

Edited by Darren Drake (12/02/12 09:24 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: Darren Drake]
      #5549956 - 12/02/12 09:03 AM Attachment (416 downloads)

another view....

Edited by Darren Drake (12/02/12 09:04 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: Darren Drake]
      #5549958 - 12/02/12 09:04 AM Attachment (326 downloads)

another view...

Edited by Darren Drake (12/02/12 09:05 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: Darren Drake]
      #5549964 - 12/02/12 09:06 AM Attachment (281 downloads)

another....

Edited by Darren Drake (12/02/12 09:07 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: Darren Drake]
      #5549966 - 12/02/12 09:08 AM Attachment (261 downloads)

another

Edited by Darren Drake (12/02/12 09:09 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: Darren Drake]
      #5549968 - 12/02/12 09:09 AM Attachment (257 downloads)

inside the base...

Edited by Darren Drake (12/02/12 09:14 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: Darren Drake]
      #5549980 - 12/02/12 09:15 AM Attachment (269 downloads)

and inside the Brandon eyepiece....

Edited by Darren Drake (12/02/12 09:16 AM)


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AhBok
professor emeritus


Reged: 12/02/10

Re: Inside Quester new [Re: Darren Drake]
      #5549993 - 12/02/12 09:21 AM

Very cool! Thanks for sharing.

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: AhBok]
      #5550000 - 12/02/12 09:26 AM

Thanks but I wonder why is there a spring in the light baffle tube? What is that all about?? Wouldn't it interfere with the light path?

Edited by Darren Drake (12/02/12 09:28 AM)


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Starman27Moderator
Post Laureate
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Reged: 01/29/06

Loc: Illinois, Iowa
Re: Inside Quester new [Re: Darren Drake]
      #5550011 - 12/02/12 09:35 AM

What a fun look inside. I remember those ads. It's not a spring it's thereto block stray light. The inside of the baffle doesn't appear to be blackened.

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RossSackett
Carpal Tunnel
*****

Reged: 08/17/07

Loc: Memphis, TN
Re: Inside Quester new [Re: Starman27]
      #5550079 - 12/02/12 10:15 AM

SO COOL! Thanks for posting.

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thomas68
professor emeritus


Reged: 01/25/11

Loc: North west Indiana
Re: Inside Quester new [Re: RossSackett]
      #5550124 - 12/02/12 10:49 AM

It's an amazing scope, nice to see inside!

Tom


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yonkrz
scholastic sledgehammer


Reged: 11/16/06

Loc: SW Minnesota
Re: Inside Quester new [Re: thomas68]
      #5550144 - 12/02/12 11:08 AM

Thats Awsome,thanks for posting.

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jjbird
super member
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Reged: 01/17/06

Loc: Wisconsin
Re: Inside Quester new [Re: yonkrz]
      #5550271 - 12/02/12 12:34 PM

Darren,

Enjoyed it very much. Thanks for sharing!


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Masvingo
scholastic sledgehammer
*****

Reged: 01/10/12

Loc: Ayrshire, Scotland
Re: Inside Questar new [Re: Darren Drake]
      #5550299 - 12/02/12 12:53 PM

Thanks from me too for posting these pics, very interesting. I remember those ads well, as a young sprout (as Uncle Rod would say) I spent (wasted?) many an hour drooling over the Questsr ads in Sky & 'Scope wishing I had one.

Still do wish I had one.

James


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Mike E.
Carpal Tunnel


Reged: 01/26/10

Loc: Moonstone Observatory
Re: Inside Questar new [Re: Masvingo]
      #5550329 - 12/02/12 01:17 PM

Hi Darren,

Thanks for posting. By the way, does it have a serial number ?


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Erik Bakker
Post Laureate
*****

Reged: 08/10/06

Loc: The Netherlands, Europe
Re: Inside Questar new [Re: Darren Drake]
      #5550485 - 12/02/12 02:50 PM

Nice images Darren!

The eyepiece shown in the cut-away is not a Brandon, but a Japanese widefield design from the earlier days of Questar. Just count the number of glass-elements and you know it is more than the 4 in a Brandon.....


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orion61

*****

Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: Inside Quester new [Re: Darren Drake]
      #5550504 - 12/02/12 03:06 PM

Quote:

Thanks but I wonder why is there a spring in the light baffle tube? What is that all about?? Wouldn't it interfere with the light path?



If it is out of the light path it would act like a baffle!
I wonder if views with that would be half A*s LOL


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stevew
Now I've done it


Reged: 03/03/06

Loc: British Columbia Canada
Re: Inside Questar new [Re: Darren Drake]
      #5550719 - 12/02/12 05:27 PM

Excellent post.
But just to be clear, is this the 90mm Questar?

Steve


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stevew
Now I've done it


Reged: 03/03/06

Loc: British Columbia Canada
Re: Inside Questar new [Re: stevew]
      #5550739 - 12/02/12 05:39 PM

No plastic!
Spectacular!
Incredible craftsmanship.
No wonder they are worth so much.

Thanks for posting.


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Masvingo
scholastic sledgehammer
*****

Reged: 01/10/12

Loc: Ayrshire, Scotland
Re: Inside Questar new [Re: stevew]
      #5550750 - 12/02/12 05:47 PM

Yup, this is the 3.5" (90mm) Questar.

James


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar new [Re: Masvingo]
      #5550804 - 12/02/12 06:30 PM

I was not able to find a serial number but I'm also not sure where to look.

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Billydee
professor emeritus
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Reged: 01/23/08

Loc: Winter Haven, FL
Re: Inside Questar new [Re: Darren Drake]
      #5551003 - 12/02/12 08:40 PM

Darren,

Nice Post. If it has a serial number it is on the bottom base plate. Pick the Lady up and turn her over and it will be on that plate. In the early ones (before the mid-1990s) it was just put on by hand and not stamped.

Thanks for the Post, Bill


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greedyshark
professor emeritus
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Reged: 10/31/05

Loc: 3rd Rock
Re: Inside Quester new [Re: Darren Drake]
      #5551030 - 12/02/12 08:58 PM

Nice! Thanks for posting!

Charles


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Jaimo!
Pooh-Bah
*****

Reged: 10/11/07

Loc: Exit 135 / 40° North
Re: Inside Questar new [Re: stevew]
      #5551062 - 12/02/12 09:13 PM

Thanks!

Jaimo!


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jouster
scholastic sledgehammer


Reged: 11/27/05

Re: Inside Questar new [Re: Jaimo!]
      #5551270 - 12/02/12 11:24 PM

Can it split doubles?

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Larry Geary
Carpal Tunnel
*****

Reged: 09/24/06

Re: Inside Questar new [Re: jouster]
      #5552803 - 12/03/12 08:51 PM

The spring inside the baffle tube serves as a series of baffle rings. (On my Questar, the inside of the baffle tube and the spring are blackened, as well as the outside of the end of the baffle tube.) It works very well. Pointing the scope directly at a light bulb and looking through the baffle tube from the back, there are no stray reflections.

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Darren Bly
sage
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Reged: 07/24/06

Loc: Bakersfield, Ca
Re: Inside Questar new [Re: jouster]
      #5552820 - 12/03/12 09:02 PM

Quote:

Can it split doubles?




Sure but you only get to see one of them!


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GeneT
Ely Kid
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Reged: 11/07/08

Loc: South Texas
Re: Inside Questar new [Re: Darren Drake]
      #5552882 - 12/03/12 09:29 PM

Cool--really cool! Brought back memories of long ago.

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DoctorNoodle
Pooh-Bah
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Reged: 07/14/07

Loc: Lawn Guyland, NY
Re: Inside Questar new [Re: GeneT]
      #5554533 - 12/04/12 07:47 PM

Beautiful!!! Thanks for posting those pics.

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blave
member
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Reged: 08/11/09

Re: Inside Questar new [Re: DoctorNoodle]
      #5554955 - 12/05/12 01:01 AM

Your efforts in taking these pictures are very much appreciated. I received from my parents (at my request) a copy of The Telescope Handbook and Sky Atlas on my 21st birthday -- in 1980. It had that wonderful cutaway view of the Q3.5, and I've wanted one ever since (quite a lot!). So, for my 50th birthday, I bought a 1972 model with 2004 optics for myself... I'll never let it go!

Dave B.
San Jose, CA


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: Inside Questar new [Re: Larry Geary]
      #5555681 - 12/05/12 01:26 PM

Quote:

The spring inside the baffle tube serves as a series of baffle rings. (On my Questar, the inside of the baffle tube and the spring are blackened, as well as the outside of the end of the baffle tube.) It works very well. Pointing the scope directly at a light bulb and looking through the baffle tube from the back, there are no stray reflections.




I would've guessed that the act of cutting in half released the spring from its original position but the truth is even more interesting. The spring is there obviously to eliminate mirror shift but its dual use as a baffle is ingenious. Celestron and Meade could pick up this trick.

Tanveer.


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: Inside Quester new [Re: Darren Drake]
      #5555684 - 12/05/12 01:27 PM

Quote:

and inside the Brandon eyepiece....




It's a 2-1-2! I thought Brandons were all 2-2.

Thanks for taking the pictures, Darren.

Tanveer.


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: Inside Quester new [Re: Darren Drake]
      #5555687 - 12/05/12 01:28 PM

Quote:

another view....




I understand the prism diagnonal and the eyepiece above. What's the tube directly opposite the eyepiece for?

Tanveer.


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Quester new [Re: TG]
      #5555695 - 12/05/12 01:34 PM

That tube below the eyepiece is the finder with the lenses built in which is reflecting at 90 degrees from a small mirror below it.

Edited by Darren Drake (12/05/12 01:53 PM)


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: Inside Quester new [Re: Darren Drake]
      #5555712 - 12/05/12 01:47 PM

Quote:

That tube below the eyepiece is the finder with the lenses built which is reflecting at 90 degrees from a small mirror below it.




Makes sense, thanks.

Tanveer.


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ColoHank
Carpal Tunnel
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Reged: 06/07/07

Loc: western Colorado
Re: Inside Questar new [Re: TG]
      #5557277 - 12/06/12 10:55 AM

Quote:

The spring is there obviously to eliminate mirror shift but its dual use as a baffle is ingenious. Celestron and Meade could pick up this trick.





The small coil-spring inside the baffle tube assembly doesn't exert any force on the mirror and therefore doesn't regulate mirror shift. It serves as a baffle only. The large coil-spring at the rear of the scope does bear against the back of the mirror and helps reduce shift. So also do the carefully fitted spacers (now teflon pads) which are situated to take up any slack between the fixed inner and sliding outer baffle tubes.

Edited by ColoHank (12/06/12 10:57 AM)


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Howie Glatter
Vendor


Reged: 07/04/06

Re: Inside Questar new [Re: Darren Drake]
      #5557418 - 12/06/12 12:16 PM

I'm guessing that Yuri Petrunin of TEC must have seen the ads with the cut-away Questar, because he brought a cut-away version of his own Mac (I think it was a 150mm)to the Winter Star Party about ten years ago.

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar new [Re: Howie Glatter]
      #5559963 - 12/07/12 09:00 PM

I just took a few more pics of the cut up Questar at some interesting angles. I will post them tomorrow. Stay tuned....

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yonkrz
scholastic sledgehammer


Reged: 11/16/06

Loc: SW Minnesota
Re: Inside Questar new [Re: Darren Drake]
      #5560002 - 12/07/12 09:36 PM

Great,will be on the lookout,that thing is awesome.

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar new [Re: yonkrz]
      #5560035 - 12/07/12 10:05 PM

One of the shots is sure to raise eyebrows. Again stay tuned....

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EJN
Carpal Tunnel
*****

Reged: 11/01/05

Loc: 53 miles west of Venus
Re: Inside Questar new [Re: Darren Drake]
      #5560155 - 12/07/12 11:26 PM

How's the star test with that? And who is Mr. Mars?

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: EJN]
      #5560200 - 12/08/12 12:04 AM Attachment (65 downloads)

The underside...

Edited by Darren Drake (12/08/12 12:04 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560203 - 12/08/12 12:06 AM Attachment (68 downloads)

In finder mode with the prism diagonal slid to the side so the finder is producing the view

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560206 - 12/08/12 12:07 AM Attachment (71 downloads)

closeup of the coating on meniscus outside..

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560209 - 12/08/12 12:09 AM Attachment (62 downloads)

Inside of meniscus also coated!? I didn't realize both sides were coated....

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560211 - 12/08/12 12:10 AM Attachment (67 downloads)

The barlow component is in place unlike in the first series..

Edited by Darren Drake (12/08/12 12:11 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560216 - 12/08/12 12:13 AM Attachment (53 downloads)

Extra close up of eyepiece...

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560218 - 12/08/12 12:14 AM Attachment (76 downloads)

For some reason this one is just extra EXTRA cool!

Edited by Darren Drake (12/08/12 12:18 AM)


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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5560238 - 12/08/12 12:34 AM Attachment (65 downloads)

Here the area right behind the mirror can be seen.

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JJK
Carpal Tunnel


Reged: 04/28/08

Re: Inside Questar new [Re: EJN]
      #5560503 - 12/08/12 08:19 AM

Quote:

How's the star test with that? And who is Mr. Mars?




The optics of the cutaway Questar test at half wave.


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Masvingo
scholastic sledgehammer
*****

Reged: 01/10/12

Loc: Ayrshire, Scotland
Re: Inside Questar new [Re: JJK]
      #5560625 - 12/08/12 10:21 AM



Great pictures Darren, very interesting to see underneath the hood, so to speak!

Lovely to see the pic showing it with the original ad.

James

Edited by Masvingo (12/08/12 10:23 AM)


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Daniel Mounsey
Vendor (Woodland Hills)
*****

Reged: 06/12/02

Re: Inside Questar new [Re: Darren Drake]
      #5560694 - 12/08/12 11:07 AM

Darren, thanks for sharing these wonderful images. The Questar is a marvel of engineering.

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John Jarosz
Astro Gearhead
*****

Reged: 04/25/04

Loc: Fairfax, Iowa
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5563212 - 12/09/12 09:53 PM

Nice pics. I always thought the primary was much thinner.

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Ed Kessler
Pooh-Bah
*****

Reged: 05/17/06

Loc: Millersburg, PA
Re: Inside Questar NEW PICS! new [Re: John Jarosz]
      #5563221 - 12/09/12 09:58 PM

Thanks for sharing the photos, Darren!

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wky46
Carpal Tunnel
*****

Reged: 12/12/05

Loc: west Ky.
Re: Inside Questar NEW PICS! new [Re: Ed Kessler]
      #5563248 - 12/09/12 10:20 PM

It almost seems a bit of a pity though, poor thing. Anyway, still very cool Darren, thanks.

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wky46
Carpal Tunnel
*****

Reged: 12/12/05

Loc: west Ky.
Re: Inside Questar NEW PICS! new [Re: Ed Kessler]
      #5563249 - 12/09/12 10:20 PM

*

Edited by wky46 (12/09/12 10:26 PM)


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bierbelly
Postmaster
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Reged: 01/23/04

Loc: Sterling, VA
Re: Inside Questar NEW PICS! new [Re: wky46]
      #5563856 - 12/10/12 10:00 AM

After seeing this, I'm giving serious consideration to cutting my Vega in half!

<-----------


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telescopeguy238
member


Reged: 04/13/08

Re: Inside Questar NEW PICS! new [Re: bierbelly]
      #5563862 - 12/10/12 10:03 AM

Is that the same one that was in the Adler Planetarium. I remember seeing it there for years.

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: telescopeguy238]
      #5563871 - 12/10/12 10:09 AM

Yes it is the same one from Adler. It has been on permanent loan.

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5564296 - 12/10/12 02:41 PM

Question: Does anyone know why both sides of the meniscus are coated in the center with a relfective coating? Is this typical of maks???

Edited by Darren Drake (12/10/12 03:24 PM)


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ColoHank
Carpal Tunnel
*****

Reged: 06/07/07

Loc: western Colorado
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5564481 - 12/10/12 04:46 PM

Quote:

Question: Does anyone know why both sides of the meniscus are coated in the center with a relfective coating? Is this typical of maks???




I believe a clarification is in order. Both sides of a Questar's meniscus are coated with magnesium fluoride or multi-coated with a combination of other substances to reduce unwanted reflections off the surfaces of the glass and thus enhance light transmission through most of the meniscus. In addition, a relatively small area at the center of one surface of the meniscus is also coated with aluminum or silver to create a mirrored spot (the secondary). On earlier Questars, like the cutaway model, the secondary mirror was located on the outer surface of the meniscus. On later Questars, it's deposited on the inner surface of the meniscus, and an opaque plastic disk is the centered on the outer surface. The mirrored spot, whether on the inside or outside surface of the meniscus, forms what is also known as the central obstruction.


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telescopeguy238
member


Reged: 04/13/08

Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5564857 - 12/10/12 08:36 PM

And it has been at Cernan for 22 years? Boy, time flies. Seems like yesterday that I saw it at Adler.

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Darren Drake
Carpal Tunnel
*****

Reged: 10/09/02

Loc: Chicagoland
Re: Inside Questar NEW PICS! new [Re: telescopeguy238]
      #5564874 - 12/10/12 08:47 PM

I'm pretty sure it was there when I started in 1990.

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Dave O
sage
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Reged: 12/21/11

Loc: Sri Lanka
Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #5590703 - 12/27/12 03:15 AM

Wow --- very nice, thanks for sharing.

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Napersky
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Reged: 01/27/10

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Re: Inside Questar NEW PICS! new [Re: Dave O]
      #5594347 - 12/29/12 12:53 PM

When I first saw that scope at the Cernan I thought, "Who would do such a thing to a telescope?" It is amazing that Questar has been in business now for over 60 years producing and selling these little scopes every week and making money at it. They have to produce hundreds a year and there must be thousands out there but you don't see them. Even if they only produce 100 a year, 2 a week which is not much to keep a business with employees going, means there should be over 6,000 Questars in circulation!

Mark


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ColoHank
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Reged: 06/07/07

Loc: western Colorado
Re: Inside Questar NEW PICS! new [Re: Napersky]
      #5595376 - 12/30/12 12:11 AM

Most of Questar's scopes are destined for industrial and government use. The production of instruments for backyard astronomy is only a sideline.

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munirocks
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Reged: 10/21/13

Loc: Bourne End, UK
Re: Inside Questar new [Re: Darren Drake]
      #6192734 - 11/13/13 02:06 PM

I've recently joined this forum and just came across this year-old thread as I work my way through the old Questar posts. I've just ordered the 50th Anniversary model, and now I can see where the money goes. Holy Cow! Thanks for posting the pics; they are brilliant and unique.

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Darren Drake
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Reged: 10/09/02

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Re: Inside Questar new [Re: munirocks]
      #6194160 - 11/14/13 09:06 AM

Glad to hear you like the pics. I espeically like the one that has the S&T add it was in. I made sure to place it at the exact same angle as in the add.

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Itz marcus
Pooh-Bah
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Reged: 02/12/06

Loc: Brooklyn NY
Re: Inside Questar new [Re: Darren Drake]
      #6194452 - 11/14/13 12:09 PM

Wow I just saw this thread for the first time.
This should've been in Willy Wonka's office


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saemark30
Pooh-Bah


Reged: 02/21/12

Re: Inside Questar NEW PICS! new [Re: Darren Drake]
      #6194910 - 11/14/13 04:19 PM

Does it work? If yes it would only be half as bright ^)

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thesubwaypusher
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Reged: 07/08/04

Loc: New York City
Re: Inside Questar new [Re: Darren Drake]
      #6212415 - 11/24/13 12:20 AM

Wasn't that nice!

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