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SHOW US YOUR DOBSONIAN! ****

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1259 replies to this topic

#101 eklf

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Posted 22 January 2014 - 01:05 PM

...
Ugly and incomplete, or....


My latest creation falls in the above quoted category. It is not a "pure" dobson mount as the two axis are off-set (a hernieted disc prevents me from bending forward without pain). Nor does it hold a true reflector, but a C8. But it was cheap to make (free as I used scrap), is very sturdy, and works like a charm.

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#102 Sirius76

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Posted 22 January 2014 - 01:05 PM

Oh yeah!
The most important part, COFFEE!!
I'm not setting up a booth this year, but might be helping Howie Glatter.
So unless he wants a demo-scope(he uses his 18" Ob) I probably won't bring it.


Hey, we can always use a demo scope! :)

And we're right next to Howie, you know that!

#103 ckwastro

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Posted 22 January 2014 - 05:02 PM

The focuser is shimmed out 2.5"


Where did you get the large focus knob for the Feathertouch? I'd love to put one on my Stowaway's FT. Thanks!

#104 ckwastro

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Posted 22 January 2014 - 05:06 PM


The focuser is shimmed out 2.5"


Where did you get the large focus knob for the Feathertouch? I'd love to put one on my Stowaway's FT. Thanks!


Found one on the FT website. If that's the one you have I didn't realize they made those.

#105 Roger Greenwood

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Posted 22 January 2014 - 05:16 PM

I got the giant focuser knob from Starlight Instruments, directly.
There are 2 inch and 3 inch versions. I would say call and
ask for Wayne.

#106 ckwastro

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Posted 22 January 2014 - 05:18 PM

Great, thanks Roger!

#107 eklf

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Posted 22 January 2014 - 06:52 PM

How is the OCA attached to the base?

I see a zip tie and 2 toilet flanges...


THe OCA is attached to Large C-bracket - kinda like a Fork, with the toilet flanges (that are attached to the vertical arms of the fork) riding on the gooves to provide altitude motion. The OTA is attached to the C-Fork via a vixen saddle and the integrated vixen dovetail of the OTA.

The zip ties are merely to hold the telrad base while I figure its best position for me.

Here is another picture to clarify...

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#108 mattyfatz

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Posted 22 January 2014 - 09:35 PM

That's pretty cool.. A Dobsonian Catadioptric. How is the motion? It seems like the altitude movements would be easy, but more force would be required on the Azimuth.

#109 eklf

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Posted 22 January 2014 - 10:42 PM

Thanks Mattyfatz.

The azimuth is also smooth because it rides on a 4-inch teflon disc that moves against the flat metal surface of the surveyor tripod. I really like it because I can sit comfortablly with my legs _under_ the OTA...most comfortable seating position for me. Also, because the OTA is attached via dovetail, I can as easily use my 5-inch f6.5 and 4-inch f10 refractors as well as my large 15x70 binoculars (each of which has its own dove tail). The refractors are an equal joy to use, the binoculars require a little too much neck twisting for my tastes. My next project may be to lengthen the horizontal section of the C/fork and attach another dovetail saddle so I can use the wide-field refractor together with the C8.

#110 demetry

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Posted 23 January 2014 - 12:20 PM

Thanks, Bob

#111 Paul Morow

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Posted 23 January 2014 - 06:26 PM

My old 18" Obsession at the 1996 AstroFest.

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#112 Paul Morow

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Posted 23 January 2014 - 06:34 PM

Working my 18" Obsession under the dark skies of Texas in 1997.
Larry Mitchell's 36" f/5 Obsession can be seen in the background.

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#113 DoctorNoodle

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Posted 24 January 2014 - 05:25 PM

Here's a pic of my Coulter Odyssey compact 10.1" f/4.5. It was purchased new in 1985 and sold in 2007 at the insistence of my back. I took this scope to dark sky sites up and down the east coast and miss it dearly.

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#114 DoctorNoodle

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Posted 24 January 2014 - 05:28 PM

Here's a 1/8 scale slapped-together model of my Odyssey made from balsa and a teepee tube. The focuser and Telrad are made from scrap plastic. The tube is about 5 3/8 inches long.

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#115 Chaz659

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Posted 24 January 2014 - 05:48 PM

:goodjob: That's great.

#116 kfiscus

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Posted 24 January 2014 - 08:22 PM

My fully-customized Z12.

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#117 Michael Rapp

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Posted 24 January 2014 - 09:29 PM

Heh, I like the "12" in the corner. That's cool.

#118 lbsgville

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Posted 25 January 2014 - 12:25 AM

Ken send that design to the folks at Zhumell, they should buy it from you, very nice. It took me a few seconds to see the Z then that made the number 12 really cool.

#119 kfiscus

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Posted 25 January 2014 - 01:13 AM

Thanks, guys. Here's a bonus brag view. Did anybody notice the homage(?) to M-31 and friends? The top hole (M-32?) is functional, too. I mount a filtered C5 OTA in either one for solar outreach.

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#120 okieav8r

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Posted 25 January 2014 - 01:44 AM

Thanks, guys. Here's a bonus brag view. Did anybody notice the homage(?) to M-31 and friends? The top hole (M-32?) is functional, too. I mount a filtered C5 OTA in either one for solar outreach.



Very clever Ken! :bow:

#121 David Knisely

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Posted 25 January 2014 - 03:21 AM

Here is "The Black Mamba", my 14 inch f/4.6 Orion Dob with mirrors by Mike Lockwood:

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#122 Ed D

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Posted 25 January 2014 - 07:59 AM

Here's my 'trash scope'. Really, I made it mostly out of trash. The biggest expenditure were two cans of finish.

Ed D
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#123 Paul Morow

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Posted 25 January 2014 - 10:02 AM

Moved up from the 18 to a 25" f/5 Obsession in 2001.

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#124 Paul Morow

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Posted 25 January 2014 - 10:05 AM

My 25" Obsession waiting for darkness next to the 28" Starmaster of the Prairie Grass Observatory, located between Mulberry and Frankfort, IN.

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#125 Michael Rapp

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Posted 25 January 2014 - 12:07 PM

Did anybody notice the homage(?) to M-31 and friends? The top hole (M-32?) is functional, too.


That is so clever! Never in a millions years would I ever have thought to do something like that! Very creative and it looks great!


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