Jump to content


Photo

Inside Questar

  • Please log in to reply
71 replies to this topic

#51 JJK

JJK

    Surveyor 1

  • -----
  • Posts: 1980
  • Joined: 27 Apr 2008

Posted 08 December 2012 - 08:19 AM

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


The optics of the cutaway Questar test at half wave.

#52 Masvingo

Masvingo

    Viking 1

  • *****
  • Posts: 882
  • Joined: 10 Jan 2012
  • Loc: Ayrshire, Scotland

Posted 08 December 2012 - 10:21 AM

:funny:

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

#53 Daniel Mounsey

Daniel Mounsey

    Vendor (Woodland Hills)

  • *****
  • Vendors
  • Posts: 5447
  • Joined: 12 Jun 2002

Posted 08 December 2012 - 11:07 AM

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

#54 John Jarosz

John Jarosz

    Astro Gearhead

  • *****
  • Posts: 3209
  • Joined: 25 Apr 2004
  • Loc: Fairfax, Iowa

Posted 09 December 2012 - 09:53 PM

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

#55 Ed Kessler

Ed Kessler

    Apollo

  • *****
  • Posts: 1208
  • Joined: 17 May 2006
  • Loc: Millersburg, PA

Posted 09 December 2012 - 09:58 PM

Thanks for sharing the photos, Darren!

#56 wky46

wky46

    Surveyor 1

  • *****
  • Posts: 1950
  • Joined: 12 Dec 2005
  • Loc: west Ky.

Posted 09 December 2012 - 10:20 PM

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

#57 wky46

wky46

    Surveyor 1

  • *****
  • Posts: 1950
  • Joined: 12 Dec 2005
  • Loc: west Ky.

Posted 09 December 2012 - 10:20 PM

*

#58 bierbelly

bierbelly

    Fly Me to the Moon

  • *****
  • Posts: 6594
  • Joined: 23 Jan 2004
  • Loc: Sterling, VA

Posted 10 December 2012 - 10:00 AM

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

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

#59 telescopeguy238

telescopeguy238

    Explorer 1

  • -----
  • Posts: 86
  • Joined: 13 Apr 2008

Posted 10 December 2012 - 10:03 AM

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

#60 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2780
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 10 December 2012 - 10:09 AM

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

#61 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2780
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 10 December 2012 - 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???

#62 ColoHank

ColoHank

    Vanguard

  • *****
  • Posts: 2315
  • Joined: 07 Jun 2007
  • Loc: western Colorado

Posted 10 December 2012 - 04:46 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???



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.

#63 telescopeguy238

telescopeguy238

    Explorer 1

  • -----
  • Posts: 86
  • Joined: 13 Apr 2008

Posted 10 December 2012 - 08:36 PM

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

#64 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2780
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 10 December 2012 - 08:47 PM

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

#65 Dave O

Dave O

    Ranger 4

  • *****
  • Posts: 377
  • Joined: 21 Dec 2011
  • Loc: Sri Lanka

Posted 27 December 2012 - 03:15 AM

Wow --- very nice, thanks for sharing. :)

#66 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2037
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 29 December 2012 - 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

#67 ColoHank

ColoHank

    Vanguard

  • *****
  • Posts: 2315
  • Joined: 07 Jun 2007
  • Loc: western Colorado

Posted 30 December 2012 - 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.

#68 munirocks

munirocks

    Explorer 1

  • -----
  • Posts: 78
  • Joined: 21 Oct 2013
  • Loc: Bourne End, UK

Posted 13 November 2013 - 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! :bow: Thanks for posting the pics; they are brilliant and unique.

#69 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2780
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 14 November 2013 - 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.

#70 Itz marcus

Itz marcus

    Apollo

  • *****
  • Posts: 1215
  • Joined: 12 Feb 2006
  • Loc: Brooklyn NY

Posted 14 November 2013 - 12:09 PM

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

#71 saemark30

saemark30

    Apollo

  • -----
  • Posts: 1140
  • Joined: 21 Feb 2012

Posted 14 November 2013 - 04:19 PM

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

#72 thesubwaypusher

thesubwaypusher

    Viking 1

  • *****
  • Posts: 942
  • Joined: 08 Jul 2004
  • Loc: New York City

Posted 24 November 2013 - 12:20 AM

Wasn't that nice!






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics