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Equipment Discussions >> Reflectors

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robininni
scholastic sledgehammer


Reged: 04/18/11

Loc: Stephenville, TX
What's the largest size amateur dob available?
      #5921320 - 06/14/13 09:49 PM

Just curious. I know Starmaster makes 30". What's the biggest that wouldn't be some special abnormal custom order?

You know, such that one could purchase the structure for it from one of the usual places and one of the usual suspects would make the mirror?

Thanks,

Rob


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nevy
professor emeritus
*****

Reged: 02/07/12

Loc: UK
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5921343 - 06/14/13 10:04 PM

I know a bloke called Nasa whose got a quite big one in space.

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robininni
scholastic sledgehammer


Reged: 04/18/11

Loc: Stephenville, TX
Re: What's the largest size amateur dob available? new [Re: nevy]
      #5921347 - 06/14/13 10:06 PM

Quote:

I know a bloke called Nasa whose got a quite big one in space.




Hence I put the following line in the original post:

You know, such that one could purchase the structure for it from one of the usual places and one of the usual suspects would make the mirror?



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plyscope
Pooh-Bah


Reged: 11/23/06

Loc: Perth, West Australia
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5921354 - 06/14/13 10:09 PM

web page Normand Fullum telescopes

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nevy
professor emeritus
*****

Reged: 02/07/12

Loc: UK
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5921374 - 06/14/13 10:20 PM

Quote:

Quote:

I know a bloke called Nasa whose got a quite big one in space.




Hence I put the following line in the original post:

You know, such that one could purchase the structure for it from one of the usual places and one of the usual suspects would make the mirror






Oi , it was a joke ha ha , we'll I thought it was funny.

Edited by nevy (06/14/13 10:24 PM)


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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5921387 - 06/14/13 10:23 PM

Starstructure makes the smallest rigs for the largest mirrors with the horizon series. Up to 40".

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Mike B
Starstruck
*****

Reged: 04/06/05

Loc: shake, rattle, & roll, CA
Re: What's the largest size amateur dob available? new [Re: nevy]
      #5921611 - 06/15/13 02:04 AM

Quote:

Oi , it was a joke ha ha , we'll I thought it was funny.



Isn't that the scope that came with defective optics from the start?... had to fitted with after-market corrective lenses? You want somethin' like that from the usual supplier?



I think i'll be stickin' with the "usual" amateur suppliers- thanks.


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nevy
professor emeritus
*****

Reged: 02/07/12

Loc: UK
Re: What's the largest size amateur dob available? new [Re: Mike B]
      #5921805 - 06/15/13 08:12 AM

Quote:

Quote:

Oi , it was a joke ha ha , we'll I thought it was funny.



Isn't that the scope that came with defective optics from the start?... had to fitted with after-market corrective lenses? You want somethin' like that from the usual supplier?



I think i'll be stickin' with the "usual" amateur suppliers- thanks.





Obsession perhaps
Before I get poked with another stick , I may need to clarify that this is another joke


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kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: What's the largest size amateur dob available? new [Re: nevy]
      #5921828 - 06/15/13 08:46 AM

I am getting a meter blank soon I hope I think think that is the new big .

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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: What's the largest size amateur dob available? new [Re: kfrederick]
      #5921860 - 06/15/13 09:11 AM

did you get it anealed?

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turtle86
Pooh-Bah Everywhere Else
*****

Reged: 10/09/06

Re: What's the largest size amateur dob available? new [Re: robininni]
      #5921925 - 06/15/13 10:02 AM

Quote:

Just curious. I know Starmaster makes 30". What's the biggest that wouldn't be some special abnormal custom order?

You know, such that one could purchase the structure for it from one of the usual places and one of the usual suspects would make the mirror?

Thanks,

Rob




I'd contact Starstructure and Mike Lockwood.


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Fred1
Carpal Tunnel
*****

Reged: 09/19/07

Loc: Somewhere in the Orion Spur
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5922467 - 06/15/13 03:42 PM

Quote:

Just curious. I know Starmaster makes 30". What's the biggest that wouldn't be some special abnormal custom order?
...
Thanks,

Rob




I think going beyond 40" might, to some, be considered "some special abnormal custom order" so if you're looking to consider what the "biggest" normal is, then, IMHO perhaps 36" is the limit for normal. FWIW, I have first hand information from someone who was investigating such sizes. He posed many inquiries to owners of such, all of whom reportedly claimed one-man set-up, but when my friend actually saw them setting up, none of the owners of these large scopes set up these enormous scopes by themselves. YMMV.

ps: If you are considering going REALLY BIG, then you MUST see these scopes in person, even those in private observatories that never transport anywhere. I spent some time with Tom Clark's 42" when he was still in Chiefland. These are not scopes designed for the faint of heart.


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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: What's the largest size amateur dob available? new [Re: Fred1]
      #5922488 - 06/15/13 04:10 PM

Take a look at this: http://www.cruxis.com/scope/scope1070.htm

I would think more than twice before attempting to get something that monstrously huge.


Clear skies!
Thomas, Denmark


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robininni
scholastic sledgehammer


Reged: 04/18/11

Loc: Stephenville, TX
Re: What's the largest size amateur dob available? new [Re: Astrojensen]
      #5922497 - 06/15/13 04:24 PM

Quote:

Take a look at this: http://www.cruxis.com/scope/scope1070.htm

I would think more than twice before attempting to get something that monstrously huge.


Clear skies!
Thomas, Denmark




Ha, yeah, that's too big to not be stationary in an observatory in my opinion!

Rob


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UmaDog
Carpal Tunnel
*****

Reged: 09/15/10

Loc: Long Island, NY
Re: What's the largest size amateur dob available? new [Re: Astrojensen]
      #5922504 - 06/15/13 04:28 PM

The great thing about Hänssgen's scope is that it doubles as an RV: at the end of the night he can cover the mirror, tilt the OTA upright, and go to sleep curled up in the mirror box. As you can see, though, he keeps this bedroom rather messy: http://www.cruxis.com/scope/img1070/1070_InTrailer9.jpg

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gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: What's the largest size amateur dob available? new [Re: UmaDog]
      #5922557 - 06/15/13 05:05 PM

There are 50s running around now, you can check Mike Lockwoods site. There are probaby ten or more 40's out there some of which have a long history, JMI, and Swayze come to mind, that have been around for 20 years or so.

Budget trailer size are what becomes limiting.... I think much above 30 your enter a new class of massive, generally permanent scopes...


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jpcannavo
scholastic sledgehammer
*****

Reged: 02/21/05

Loc: Ex NYCer, Now in Denver CO!
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5924074 - 06/16/13 04:43 PM

Rob,
What are you thinking...!


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robininni
scholastic sledgehammer


Reged: 04/18/11

Loc: Stephenville, TX
Re: What's the largest size amateur dob available? new [Re: jpcannavo]
      #5924093 - 06/16/13 04:54 PM

Quote:

Rob,
What are you thinking...!




Haha! Just asking!


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JayinUTModerator
I'm not Sleepy
*****

Reged: 09/19/08

Loc: Utah
Re: What's the largest size amateur dob available? new [Re: robininni]
      #5924220 - 06/16/13 06:29 PM

I talked with Mike Lockwood in the spring and voice mail with Mike about a 36 inch dob. Still looking at it but it will be fall before I can move forward with it (stuff happens when you own some farms you lease out and have to do some replacement of equipment).

Anyway, Mike Clements is building and is almost done with his 70 inch reflector which is out at Steve Dobbs home/land. Here is a link to a post in February on that from my blog.


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turtle86
Pooh-Bah Everywhere Else
*****

Reged: 10/09/06

Re: What's the largest size amateur dob available? new [Re: Astrojensen]
      #5924416 - 06/16/13 09:01 PM

Quote:

Take a look at this: http://www.cruxis.com/scope/scope1070.htm

I would think more than twice before attempting to get something that monstrously huge.


Clear skies!
Thomas, Denmark




I think a scope that size would be fine in a permanent observatory, but I'd definitely think twice about trying to transport one. I'd also think twice about using a scope that size for solar observing, as shown in one of the pics. I'd be concerned that with the tiniest flaw in that solar filter, one's face would melt like a candle as in that scene from Raiders of the Lost Ark.


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