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Long slow Newtonians

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#226 icomet

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Posted 16 April 2020 - 03:37 PM

Tape wrapped around the tube before I painted it, to get the stripe.



#227 icomet

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Posted 25 April 2020 - 10:33 PM

Newts of the following optics size/focal ratios - 

10" f/4.7 (Orion)

10" f/6 (Swayze)

10" f/7.5 (suspected Optical Craftsman or Cave Astrola)

 

All three scopes will be built using the same type/size of tube (fiber).

All will be able to then be able to share a set of Cave Astrola 12" rotating rings, providing

I can get the rings to fit. 

 

Well, boys and girls, this little ATM'er has found a lathe with 15" jaws.

The rings are being "trimmed" as we speak. I'm talking a very small amount, too.

One of the scopes might be put into a dob base. Always need one of those. Also work better for

the "huddled masses" outreach sessions. The scope can then be made "fudgeicle proof" more 

easily, and "feet on the ground", also.

 

Image of rings after cleaning and before machining.

Clear Skies.
 

 

Attached Thumbnails

  • rings sm (1).jpg


#228 icomet

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Posted 28 April 2020 - 05:12 PM

The rotating rings went from 12.188" ID to 12.288" ID. I will be repainting them soon.

Mean time, I started to paint the tube. It will have another color, also.  No, it doesn't glow in the dark.

 

That's the mount for the scope in the image with the inner rings.

 

Clear Skies.

 

Attached Thumbnails

  • 12.288_ ID Cave Rings.jpg
  • tube painting.jpg

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#229 icomet

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Posted 02 May 2020 - 10:15 PM

12.288"  ID for the rings fits great. But I forgot something. I had, at first, thought of a way that I should

put this OTA together. It was correct thinking; one should listen to oneself.

 

Instead, I painted the tube. You guessed it, the paint is just a little too thick. Rats!

I can get the inner ring on, it will just take a bit, and will probably have to touch up some scarring.

 

Be different. Paint something out of the ordinary. Was going to do more, but stopped here. I can always

pick up the painting where I left off. 

 

Those are 1969 Cave Astrola rotating rings hangin' there. Between those and the other 1960's parts that are

going into this scope, I should be able to get away with a posting on the "Classic Telescope" forum.

 

Clear Skies.

Attached Thumbnails

  • 10_ f_7.5 tube stripes.jpg

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#230 CCD-Freak

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Posted 05 May 2020 - 06:27 PM

Here is another scope built around an Edmund 8" F8 mirror.  I bought the mirror in a cell at the TSP swap meet around 1992 for s whopping $40.  I built a Dob with it for my son to use.  The Edmund mirror puts up very nice planetary and lunar imges and does a good job on DSOs too.   If you find an old Edmund 8" F8 mirror....grab it.!!!  (^8

 

8inF8-Dob-JL-xsm.jpg   8" F8 at TSP 94

 

John

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Edited by CCD-Freak, 05 May 2020 - 07:24 PM.

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#231 Deep13

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Posted 06 May 2020 - 11:44 AM

Here is another scope built around an Edmund 8" F8 mirror.  I bought the mirror in a cell at the TSP swap meet around 1992 for s whopping $40.  I built a Dob with it for my son to use.  The Edmund mirror puts up very nice planetary and lunar imges and does a good job on DSOs too.   If you find an old Edmund 8" F8 mirror....grab it.!!!  (^8

 

attachicon.gif8inF8-Dob-JL-xsm.jpg  8" F8 at TSP 94

 

John

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Found one, grabbed it, had Terry Ostahowski recoat it. It's on a Meade RG EQ mount.


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#232 Zamboni

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Posted 06 May 2020 - 01:56 PM

Found one, grabbed it, had Terry Ostahowski recoat it. It's on a Meade RG EQ mount.


Post reported for pornographic content!

Seriously, that sounds like an amazing planetary beast.
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#233 Jeff B

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Posted 06 May 2020 - 06:50 PM

Grad it by the edge though.


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#234 Deep13

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Posted 07 May 2020 - 01:12 PM

Post reported for pornographic content!

Seriously, that sounds like an amazing planetary beast.

I'll see if the planets are every high in the sky again. But I'll try it out on Jupiter, Mars, and Saturn this summer. I've added a cooling fan, fine focuser, a Rigel finder, Antares secondary, and a thin-vane Astrosystems holder. I'll compare it to my 5" f/12 refractor.


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#235 Galicapernistein

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Posted 07 May 2020 - 02:05 PM

I'll see if the planets are every high in the sky again. But I'll try it out on Jupiter, Mars, and Saturn this summer. I've added a cooling fan, fine focuser, a Rigel finder, Antares secondary, and a thin-vane Astrosystems holder. I'll compare it to my 5" f/12 refractor.

With only a 4” difference in focal lengths between an 8” F8 and 5” F12, that sounds like it will be an interesting comparison. 



#236 Deep13

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Posted 07 May 2020 - 03:14 PM

With only a 4” difference in focal lengths between an 8” F8 and 5” F12, that sounds like it will be an interesting comparison. 

More surface area vs. unobstructed optics.


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#237 izar187

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Posted 07 May 2020 - 11:11 PM

More surface area vs. unobstructed optics.

I think the 8 will whomp the 5 pretty soundly.


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#238 icomet

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Posted 29 May 2020 - 09:32 PM

10" f/7.5

Clear Skies.

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  • tube mounted sm.jpg

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#239 25585

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Posted 30 May 2020 - 12:03 AM

Impressive! waytogo.gif  



#240 icomet

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Posted 30 May 2020 - 12:28 PM

Okay. All long Newtonians together.

These are the long newts that I have restored or built.

 

12.5" f/7  model D 1950's  Cave Astrola

10" f/7.5 with 60's optics (Optical Craftsman ?) on a 1981 Meade DS - 16 mount

6" f/10 with Beck mirror on a "reserected" CG 5 AGT mount

 

(Blue striped "Swayze 10" f/6 dob against the wall)

 

"If you can't find what you want, 'ATM one'".  grin.gif 

 

Clear Skies.

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  • 3 long Newtonians sm 2.jpg

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