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SHOW US YOUR DOBSONIAN! ****

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#926 Gotliebc

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Posted 03 May 2020 - 05:50 PM

Here is my 8-inch Dob that I finished a couple months ago.  It is my first Dob, using Coulter mirrors I had in storage since my early 20s (decades ago).  It is made from 3/4-inch birch plywood and 1-1/2-inch PVC pipe.  It works pretty good; it is nice to actually learn the stars once again after years using a go-to.

 

 

Dob scope.PNG


Edited by Gotliebc, 03 May 2020 - 05:51 PM.

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#927 Chucky

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Posted 03 May 2020 - 06:38 PM

Nice work on that 8 Dob. Enjoy

#928 Mike G.

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Posted 04 May 2020 - 10:52 AM

 

 
 
 

 

 
12” Skywatcher with Synscan

 

welcome to CN!


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#929 DHEB

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Posted 05 May 2020 - 02:00 AM

Here is my 8-inch Dob that I finished a couple months ago.  It is my first Dob, using Coulter mirrors I had in storage since my early 20s (decades ago).  It is made from 3/4-inch birch plywood and 1-1/2-inch PVC pipe.  It works pretty good; it is nice to actually learn the stars once again after years using a go-to.

 

 

attachicon.gifDob scope.PNG

That's a beauty. Enjoy it!



#930 John Anderson

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Posted 11 May 2020 - 02:03 PM

Will be getting a GSO 12" f5 mirror ... hope it's a good one!

 

 

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#931 Pedalpoint

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Posted 12 May 2020 - 01:25 PM

Ol' Midnight ready for another campaign:

 

DSCF5923.JPG

 

 

This is a Juno 14, made about 1992.  It's a 14.5" f/4/5 with a Richard Fagin mirror.  Made using boat-building ideas, it is made of marine plywood and marine epoxy paint, with a bent plywood upper tube.  It has the advantages and disadvantages you might expect: very contrasty and sharp, no vibration problems, but very heavy.  Smallish altitude bearings mean I have to add weights to use heavy eyepieces. Closed back, and just about dew proof.  Primary has never dewed over no matter the conditions!  I've done some upgrades like DSC's and dew heating, plus a cooling fan under the mirror. Still excellent after nearly 30 years!

 

Bruce


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#932 DHEB

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Posted 12 May 2020 - 01:33 PM

Ol' Midnight ready for another campaign:

DSCF5923.JPG


This is a Juno 14, made about 1992. It's a 14.5" f/4/5 with a Richard Fagin mirror. Made using boat-building ideas, it is made of marine plywood and marine epoxy paint, with a bent plywood upper tube. It has the advantages and disadvantages you might expect: very contrasty and sharp, no vibration problems, but very heavy. Smallish altitude bearings mean I have to add weights to use heavy eyepieces. Closed back, and just about dew proof. Primary has never dewed over no matter the conditions! I've done some upgrades like DSC's and dew heating, plus a cooling fan under the mirror. Still excellent after nearly 30 years!

Bruce


That one is a beauty! 👍

#933 Walter E.

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Posted 12 May 2020 - 05:13 PM

Just picked this one up today. Starmaster 8" f/6. It looks new including the mirror! Only problem is I have NO eyepieces :-(

 

Walt

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#934 FrankG

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Posted 13 May 2020 - 11:46 AM

My 10-year-old 15" ZOC primary just back from a cross-country trip to Rainier, WA, where Carl put a beautiful new coating on it (did not really need it, but don't want to worry about it for another decade or two). About a three-week turn-around and mirror back home and back in its equally-aged Starstructure dob. Carl included a face mask and gloves for getting it out of shipping carton and back into mirror box. Wanted to share these pix -- the mirror will never look this good again!
Frank

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#935 M44

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Posted 13 May 2020 - 09:42 PM

Re-post after 3 years. Only thing added new is the home made light shield. 

 

 

 

 

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#936 M44

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Posted 13 May 2020 - 09:43 PM

pic 2:

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Edited by M44, 13 May 2020 - 09:43 PM.

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#937 stargazer32864

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Posted 18 May 2020 - 11:16 PM

The family:

 

20" f/5 Obsession (property of the Eugene Astronomical Society)

18" f/5.5 Dob (EAS)

13.1" Coulter Frankenscope (mine, from 1990)

12.5" Discovery (aka "Bob the Dob," mine)

8" Celestron SCT (my original scope, from 33 years ago)

Two 4.5" Orion Starblasts (one my wife's, one my father-in-law's)

4" f/15 Unitron refractor (mine)

4" Vixen Fluorite (in box; EAS)

70mm TeleVue Pronto (mine, but my wife thinks it's hers)

40mm Coronado PST (EAS)

Holy Moley!!!! Do you need an extra set of eyeballs to look through those pieces of art?? Some of them look lonely.
 



#938 John Anderson

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Posted 05 June 2020 - 03:29 PM

12" f5

 

 

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#939 Augustus

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Posted 07 June 2020 - 01:24 PM

Rebuilt, homemade 14.7" f/2.89. Total weight is 47 pounds, heaviest component is 28 pounds (mirror box assembly). Whole scope fits in my hatchback's trunk with the back seats up and enough room left for eyepieces and accessories.

 

bmovedcffinals.jpg

 

Features:

  • NMT styled minimalist rocker and bearings using 3/4" and 1/2" plywood, 3/4" maple, and 1" aluminum tubing. Rocker is a bit taller than necessary but allows me to put a battery underneath the mirror box and keeps the eyepiece at a more comfortable height.
  • 1/8" thick drum shell UTA with 1/2" plywood connector ring. Weighs just 3.5 pounds with secondary/spider and focuser installed and without finder or eyepieces.
  • Minimalist mirror box (only 7 inches tall).
  • Moonlite lower truss connectors and homemade upper connectors based on those by Achim Strnad and Reiner Vogel.
  • Nova Optical primary mirror and premium Antares 1/25 wave secondary mirror.
  • Destiny spider & Aurora Precision mirror cell.
  • Fake CF because it looks cool. Poles are all aluminum.
  • HC-2 focuser.

Max field of view is 1.7 degrees with a 21mm Ethos at 59x. Highest magnification I use is 354x (3.5mm Delos) and theoretically I could double that with a Barlow though I've yet to find a good reason to. Planning on building an EQ platform by fall.

 

Next scope build is a 24" (technically 23.5"). 


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#940 Nick Salt

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Posted 09 June 2020 - 08:28 PM

Hello everyone,

 

Here's my dob! I had an XT10i before going to university that was sold to me at a very fair price by a veteran amateur. Being very close to graduating now and working full time, I found a used XT12i that was in like new condition. I've been able to take it to a dark site (Bortle 2) once and use it a few times at my home (Bortle 4) in the last month and have been really impressed with the views. I have added a telrad, a cooling fan, and a convenient laptop arm that I was inspired to make from an old post on the forum. I use SkySafari on my Mac mainly, wired to the intelliscope hand controller.

 

My next steps are to improve the focuser, I am interested in the Lacerta Dual Speed 1:10 Microfocus Upgrade Kit. And of course, adding some eyepieces over time. 

 

Really enjoy this thread. It may inspire some further ideas.

 

IMG_0176.jpg

IMG_0177.jpg

IMG_0178.jpg


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#941 John Anderson

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Posted 02 July 2020 - 09:00 AM

Got my 12" f5 dob all put together ... waiting for a GSO mirror from Agena Astro.

 

Hopefully I can give an initial report of the mirror quality in a week or two.

20200701_195538.jpg


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#942 The Dobfather

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Posted 02 July 2020 - 10:54 PM

Built a dew/light shield for our 10" ES dob out of EVA foam. My daughter is VERY excited to see Jupiter this month. :)  Need to find a good remote location to make it happen so we can have some dark skies. 

50070556726_4af5f22486_c.jpg


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#943 jim kuhns

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Posted 03 July 2020 - 03:57 PM

If you think your daughter is excited about seeing Jupiter, wait until she sees Saturn
and it's rings. Both are close and only a few degrees apart.
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#944 The Dobfather

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Posted 04 July 2020 - 12:10 PM

If you think your daughter is excited about seeing Jupiter, wait until she sees Saturn
and it's rings. Both are close and only a few degrees apart.

Definitely! Waking her up at 1am will not be fun but seeing the planets should make up for it. hahaha. 



#945 Chesterguy1

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Posted 04 July 2020 - 01:46 PM

Built a dew/light shield for our 10" ES dob out of EVA foam. My daughter is VERY excited to see Jupiter this month. smile.gif  Need to find a good remote location to make it happen so we can have some dark skies. 

50070556726_4af5f22486_c.jpg

Not sure about the scope, but I really like the astronomer. I’ve had some views through the EP that elicited a similar response.

 

Chesterguy


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#946 TareqPhoto

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Posted 04 July 2020 - 03:50 PM

Got my 12" f5 dob all put together ... waiting for a GSO mirror from Agena Astro.

 

Hopefully I can give an initial report of the mirror quality in a week or two.

attachicon.gif20200701_195538.jpg

Does the mirrors coming from Agena being ready for use immediately or they need grinding? 



#947 John Anderson

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Posted 04 July 2020 - 04:55 PM

Does the mirrors coming from Agena being ready for use immediately or they need grinding? 

These are finished, aluminized mirrors.



#948 TareqPhoto

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Posted 04 July 2020 - 05:05 PM

These are finished, aluminized mirrors.

Ah ok, sounds nice



#949 Heitman

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Posted 07 July 2020 - 12:22 PM

Newest addition.

Tim

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#950 wky46

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Posted 09 July 2020 - 08:48 PM

.

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