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Who made the the biggest SCT ever? Celestron?

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#1 garret

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Posted 25 May 2016 - 01:41 PM

Almost 50 years ago Celestron had a 22" SCT whopper ($29500,=)  for sale, is this still the biggest SCT ever made? and how many did they made? any good survivor left?

How good or bad was the optical quality in those days?

 

Garret vd Veen

 

<copyrighted image removed>


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#2 Phil Barker

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Posted 25 May 2016 - 01:57 PM

a recall an article about one a few years back used as a university scope. Not sure where it was.

the finderscope is probably a c8
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#3 Struzzin

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Posted 25 May 2016 - 02:01 PM

I know nothing about it but....that's awesome! :belushi:  Now a days I think the Meade 16" is the largest mass produced.


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#4 GJJim

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Posted 25 May 2016 - 02:01 PM

They prototyped a 36-inch, but the secondary assembly was too heavy and it warped the corrector plate. Back then Celestron thought its target market for the scopes was universities and government. After Johnson hired a couple of sharp marketing guys, they discovered a much larger market among common folks who (to their amusement and amazement) were actually willing to send Celestron deposits and buy smaller SCTs sight unseen.


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#5 Astrojensen

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Posted 25 May 2016 - 03:20 PM

The biggest Schmidt-cassegrain telescope is the 2-meter (1.34 meter free aperture) Alfred Jensch Telescope at the Karl Schwarzchild Observatory in Tautenburg, Germany.

 

http://www.tls-taute...x.php?id=51&L=1

 

It's more of a Schmidt camera with additional Nasmyth and coudé foci, than a true SCT, but I'd say it counts anyway.

 

 

Clear skies!

Thomas, Denmark


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#6 cam1936

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Posted 25 May 2016 - 06:59 PM

How about biggest commercial SCT?

Meade was making a 20" just 5 or 10 years ago, no?

#7 epsilon160

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Posted 25 May 2016 - 07:30 PM

Meade MAX 20in ACF: http://www.cloudynig...de-20-rcx-r1513


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#8 cam1936

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Posted 25 May 2016 - 07:49 PM

 

I wonder how many went out the door. Looks like a lot of R&D money spent for a pretty short production run.



#9 GJJim

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Posted 25 May 2016 - 08:00 PM

How about biggest commercial SCT?

Meade was making a 20" just 5 or 10 years ago, no?

Celestron sold the 22 - inch SCTs commercially, the high price was a deterrent for most individuals. Meade's 20-inch is a bargain when the price is translated to 1960s dollars.  



#10 Lola Bruce

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Posted 25 May 2016 - 08:30 PM

Nice to see Dr. in a way back.

Bruce


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#11 Walter E.

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Posted 26 May 2016 - 06:57 AM

Tinsley made a 26" as there was one at the UCF (University of Central FL) observatory for many years before it was replaced with a modern 20" CAS.

 

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Attached Thumbnails

  • Tinsleyscope.jpg

Edited by Walter E., 26 May 2016 - 10:29 AM.

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#12 garret

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Posted 26 May 2016 - 11:32 AM

 

<copyrighted image removed>

Link to the 1968 Celestron ad: http://www.philharri...net/celes68.jpg

 

Garret



#13 Guest_djhanson_*

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Posted 26 May 2016 - 02:47 PM

 

 

<copyrighted image removed>

Link to the 1968 Celestron ad: http://www.philharri...net/celes68.jpg

 

Garret

 

Thanks for the link.  Most amazing is the translation into 2016 dollars (~6.98x 1968 to 2016):

 

C10: $14K

C16: $80K

C22: $205K

 

Thank god Celestron started mass-producing SCT's in large numbers thereafter :).  Certainly if a C11 cost $20K these days you'd likely not see to many of them around.  And if Celestron had ever brought that mythical C36 into production just imaging the list price!  I would guess $1MM in 2016 dollars.

 

cheers, DJ


Edited by djhanson, 26 May 2016 - 02:49 PM.

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#14 Ptkacik

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Posted 27 May 2016 - 08:33 PM

Wow, I liked that Meade 20" story and am glad they made it so well. I too, wonder how many of those monsters were made (or the C-22's).

My C-11 on a DX mount is a monster, I can't imagine what it takes to lift 200 pounds onto a dovetail seven feet in the air. Ha! A crane.

Clear skies,
Peter
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#15 artie hebert

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Posted 28 May 2016 - 11:38 AM

Tinsley made a 26" as there was one at the UCF (University of Central FL) observatory for many years before it was replaced with a modern 20" CAS.

 

Walt

 

That is huge.



#16 Phil Barker

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Posted 28 May 2016 - 04:00 PM

I've seen a 10 inch celestron white and blue. It belonged to a university student ben Austin

It was a beast heavier than a C11 and had a longish focal ratio

corrector wasn't coated forks etc heavy duty version of a early c8

collimation was out so wasn't able to judge how good it was at the time.
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#17 gnabgib

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Posted 29 May 2016 - 04:06 PM

Astro works corp. in Arizona made two 24.5 inch dia f/6.2 schmidt cassegrain telescopes.  I believe these were available in the late 80's. 



#18 Mordakyblu

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Posted 29 May 2016 - 04:17 PM

Celestron had a C14, I think in the mid-seventies. If memory serves.



#19 rmollise

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Posted 30 May 2016 - 10:21 AM

Almost 50 years ago Celestron had a 22" SCT whopper ($29500,=)  for sale, is this still the biggest SCT ever made? and how many did they made? any good survivor left?

How good or bad was the optical quality in those days?

 

Garret vd Veen

 

<copyrighted image removed>

 

Yes, it is still the largest production SCT ever made. The optical quality was good. How many? I'd have to check Bob Pikiel's seminal book, Celestron the Early Years, but less than 50, I believe. Yes, there are a number of survivors including one that had its corrector destroyed and which was converted to a Cassegrain design.



#20 kevin M13

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Posted 30 May 2016 - 12:50 PM

One of the Celestron C22's was at a theme park in upstate NY, Time Town, for a number of years.  Never looked through it though when I was a kid.  That park was shut at least 40 years ago.  I always wondered what happen to the scope. 

 

Kevin


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#21 rmollise

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Posted 30 May 2016 - 03:32 PM

One of the Celestron C22's was at a theme park in upstate NY, Time Town, for a number of years.  Never looked through it though when I was a kid.  That park was shut at least 40 years ago.  I always wondered what happen to the scope. 

 

Kevin

 

If I recall, that one went missing...stolen apparently. Bob P. has the whole story in his book.


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#22 EJN

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Posted 30 May 2016 - 03:48 PM

Celestron had a C14, I think in the mid-seventies. If memory serves.

 

Newsflash for those just waking up from a 20-year snooze - Celestron still makes the C14.


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#23 junomike

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Posted 30 May 2016 - 04:00 PM

 

Celestron had a C14, I think in the mid-seventies. If memory serves.

 

Newsflash for those just waking up from a 20-year snooze - Celestron still makes the C14.

 

:lol:

 

Mike


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#24 kevin M13

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Posted 30 May 2016 - 04:06 PM

 

One of the Celestron C22's was at a theme park in upstate NY, Time Town, for a number of years.  Never looked through it though when I was a kid.  That park was shut at least 40 years ago.  I always wondered what happen to the scope. 

 

Kevin

 

If I recall, that one went missing...stolen apparently. Bob P. has the whole story in his book.

 

 

Might be worth a read just for that local connection.  Funny though, wasn't there a serial number and such.  Not like you can stuff one of these away in a closet or under the bed.  ;)

 

Kevin



#25 cam1936

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Posted 30 May 2016 - 06:48 PM

 

 

One of the Celestron C22's was at a theme park in upstate NY, Time Town, for a number of years.  Never looked through it though when I was a kid.  That park was shut at least 40 years ago.  I always wondered what happen to the scope. 

 

Kevin

 

If I recall, that one went missing...stolen apparently. Bob P. has the whole story in his book.

 

 

Might be worth a read just for that local connection.  Funny though, wasn't there a serial number and such.  Not like you can stuff one of these away in a closet or under the bed.  ;)

 

Kevin

 

 

 

Sadly it is doubtful the thief was into astronomy. It is most likely someone stole it because it would be a fun this to smash at a local quarry. Some simple minds derive great pleasure from such senseless destruction. 


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