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If money were no object, what 24 inch Dob would you get

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#26 CHASLX200

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Posted 18 October 2020 - 09:34 AM

I've always wanted an Obsession scope. I know they don't make the 24" anymore so I will settle with a 22" that comes with all the bells and whistles.bow.gifwaytogo.gif

They never made a 24".



#27 Don H

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Posted 18 October 2020 - 02:06 PM

I think I would rather go with a 20" f/3.3 Lockwood quartz and keep my feet on the ground. I really like wood scopes, so a J.P. Astrocraft looks very nice, or maybe even an NMT. Also, I would like to have built in coma corrector and premium eyepieces+filters included. And since money is no object, I would ask the builders how much of a premium I would have to pay to expedite delivery, since I'm not getting any younger... 


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#28 hypergolic

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Posted 18 October 2020 - 04:28 PM

None. That's too much scope!

 

Fleep


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#29 Keith Rivich

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Posted 18 October 2020 - 08:32 PM

None. That's too much scope!

 

Fleep

No its not unless there is a physical reason to prevent you from setting up and using such a scope.

Just got back from a dark sky trip...the very last DSO I looked at with my 25" was M27.  With an OIII it is just utterly fantastic, spiritual! As was the Veil (52 Cygni section) that I looked at just before looking at the Dumbell. And the Ring before that, And...


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#30 Jon Isaacs

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Posted 18 October 2020 - 10:04 PM

If Money were no object:

 

Mirror :  Lockwood 24 inch F/3.5

 

Structure:  Built "with a lot of help from my friends"

 

Tom:  Custom cabinet maker and yacht carpenter 

 

Don: Welder fabricator par excellence

 

Ryan:  Cad/cam, finite element analysis, general engineering support plus part fabrication. Ryan has a 3D mill with an bed that will handle a 4x8 (feet) piece.

 

Design:  Either

 

Classic truss

 

or

 

my personal truss design which is all 1.5 inch-2 inch ~ 0.060" wall aluminum tubing, much of it bent into hoops/rings. As I'm fond of saying, they don't build bicycles out of plywood.. 

 

Jon



#31 bigdob24

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Posted 19 October 2020 - 08:31 AM

I think I would rather go with a 20" f/3.3 Lockwood quartz and keep my feet on the ground.
 

That’s what I thought when I sold my 24” and bought the last StarMaster , a 20 FXQ Lockwood 20” f3.3

Its a great scope , feet on the ground but after a 24” I could not get used to that 4” aperture  loss.



#32 Pinbout

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Posted 19 October 2020 - 08:49 AM

if money was no object, I'd have my own Hubble Space Telescope made and staff to run it, and have it observe online to visitors requests


Edited by Pinbout, 19 October 2020 - 08:49 AM.

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#33 Arctic eye

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Posted 19 October 2020 - 02:14 PM

One with adaptive optics system.



#34 CHASLX200

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Posted 19 October 2020 - 06:13 PM

If Money were no object:

 

Mirror :  Lockwood 24 inch F/3.5

 

Structure:  Built "with a lot of help from my friends"

 

Tom:  Custom cabinet maker and yacht carpenter 

 

Don: Welder fabricator par excellence

 

Ryan:  Cad/cam, finite element analysis, general engineering support plus part fabrication. Ryan has a 3D mill with an bed that will handle a 4x8 (feet) piece.

 

Design:  Either

 

Classic truss

 

or

 

my personal truss design which is all 1.5 inch-2 inch ~ 0.060" wall aluminum tubing, much of it bent into hoops/rings. As I'm fond of saying, they don't build bicycles out of plywood.. 

 

Jon

I agree with you other than i would want a F/6 for a 20" and F/5.5 for a 24". 24" at F/6 is kinda scary being that high up.
 



#35 stargazer193857

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Posted 19 October 2020 - 06:42 PM

If Money were no object:

Mirror : Lockwood 24 inch F/3.5

...

Jon



Why not f3 if money were no object?

#36 RedzoneMN

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Posted 19 October 2020 - 06:46 PM

Prime piece of land in high New Mexico or Chile. Well appointed way to get there, and splurge on a mediocre reflector.


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#37 Jon Isaacs

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Posted 19 October 2020 - 07:16 PM

I agree with you other than i would want a F/6 for a 20" and F/5.5 for a 24". 24" at F/6 is kinda scary being that high up.
 

 

I had a 25 inch F/5 with a real ladder. There came a time about 4 years ago, I was approaching 70 and I realized observing alone, 50 miles from the nearest hospital made me a possible Darwin award recipient.

 

I down sized to the 22 inch F/4.4. 

 

6060038-Obsession with Rolling Ladder CN.jpg
 

 

Why not f3 if money were no object?

 

I'm not that fond of fast focal ratios.  At F/3, The coma free region is 0.6mm, the collimation tolerance is 0.005", the whiskers of my beard measure 0.0039".  The Paracorr 2 does not fully correct the field of the 21mm Ethos.

 

Realistically,  I'm Happy with my 22 inch F/4.4 and a serious ladder.  The largest scope that'll fit through the motor home door is about 16 inches. I have that one covered.

 

Anything larger would live in the high desert and stay there. No ladder is nice if you have to transport the scope but a ladder with railings, wheels, an eyepiece rack, nice gentle steps is plenty good enough for me.

 

Jon


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#38 ShaulaB

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Posted 19 October 2020 - 07:20 PM

First we will purchase 100 acres in a Bortle 2 zone in Utah, then we will talk about the 24 inch SCT we will get.
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#39 CHASLX200

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Posted 19 October 2020 - 07:30 PM

I could never live with F/3 as shallow focus would kill it for me.



#40 stargazer32864

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Posted 20 October 2020 - 03:55 AM

They never made a 24".

Never?? Hummmm....that goes to show you how much I know about Obsession Scopes. I would still like to have one, tho. And an observatory to house it in.grin.gif



#41 CHASLX200

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Posted 20 October 2020 - 06:10 AM

Never?? Hummmm....that goes to show you how much I know about Obsession Scopes. I would still like to have one, tho. And an observatory to house it in.grin.gif

It was just a 18" , 20" and 25" for years. Then it was a 15" and 12.5" a few years later and a very few 30 or 36" jobs.



#42 hypergolic

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Posted 20 October 2020 - 09:18 AM

No its not unless there is a physical reason to prevent you from setting up and using such a scope.

Just got back from a dark sky trip...the very last DSO I looked at with my 25" was M27.  With an OIII it is just utterly fantastic, spiritual! As was the Veil (52 Cygni section) that I looked at just before looking at the Dumbell. And the Ring before that, And...

I've looked thru a big dob. No argument on what you can see and yes, there is a physical reason.

 

Fleep



#43 kfrederick

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Posted 20 October 2020 - 12:34 PM

I make a 24 inch Chief  With no obstructions . 


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#44 Mike Wiles

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Posted 20 October 2020 - 07:05 PM

I think I would rather go with a 20" f/3.3 Lockwood quartz and keep my feet on the ground.
 

That’s what I thought when I sold my 24” and bought the last StarMaster , a 20 FXQ Lockwood 20” f3.3

Its a great scope , feet on the ground but after a 24” I could not get used to that 4” aperture  loss.

When I picked up my 20" f/3 Spica Eyes/Lockwood scope from Tom Osypowski's shop......he was nearing completion of a 24" f/3.1 telescope with SlipStream drive and I thought to myself...."why didn't I do that?".  Bottom line is that it didn't fit a couple of my hard requirements - like being hand moveable by one person, and fitting into the back seat area of my truck.  

 

But if I were building a 24", price is no object....something extremely similar to that scope would be in mind for me.  A Lockwood created 24" f/2.8 quartz with that SlipStream drive would likely have an eyepiece height somewhere about the same as my current 20" f/3 on its six inch Equatorial Platform.   ...sigh...



#45 Pcbessa

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Posted 22 October 2020 - 02:17 PM

I love the thought of dreaming big like this, either building a cozy home or shelter next to that 24", launch it into space or use a 24" as a finder for a meter sized telescope!

And I dream of the day I own something in the 20-24" class. What's the lowest price for a 20"?

#46 stargazer193857

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Posted 22 October 2020 - 07:13 PM

I love the thought of dreaming big like this, either building a cozy home or shelter next to that 24", launch it into space or use a 24" as a finder for a meter sized telescope!

And I dream of the day I own something in the 20-24" class. What's the lowest price for a 20"?


I think around $6-8,000, with go-to. Hubble optics might be less. Definitely read the reviews on the lower end scopes before you buy.

#47 Augustus

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Posted 22 October 2020 - 07:19 PM

The one I am building, though a minivan to move it around would be nice.



#48 CrazyPanda

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Posted 22 October 2020 - 08:45 PM

If money were no object, what 24 inch Dob/plus accessories would you get?

 

Thanks

I'd end up building my own structure around a Lockwood sub F/3 mirror. I'd probably keep it simple and put it on an EQ platform for tracking rather than the hassle of wiring up a servocat and encoders.


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#49 kfrederick

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Posted 24 October 2020 - 10:41 AM

Having thought it more. I have a window Chief set in your house and view the sky . I seen Ed Jones window chief  



#50 25585

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Posted 24 October 2020 - 03:51 PM

Money no object, why stop at 24"?




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