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neoweb
Pooh-Bah


Reged: 12/10/06
Posts: 1482
Loc: UK
Push-to circles/setting circles for Dobsonians?
      #1391640 - 01/29/07 07:52 PM

Hi... i've seen in a few member's signatures reference to 'push-to circles' or 'setting circles' for their Dobsonians. I presume these are to help with object location and wonder if someone could explain how they work, how effective they are, and whether all Dobsonians can be modified to incorporate them?

Thanks as always.

--------------------
Celestron StarHopper 8" f/6 Dob
38mm Burgess 2" SWA | 30mm Ultima | 20mm Omni
17mm Hyperion | 12.5mm Baader Ortho
8mm TV Plossl | 6mm TMB/BO Planetary
Orion Shorty Plus barlow
15 X 70mm Skymasters

Saturn-like: desktop image


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kwalker
sage


Reged: 08/22/06
Posts: 293
Loc: Oklahoma City, OK
Re: Push-to circles/setting circles for Dobsonians? new [Re: neoweb]
      #1391656 - 01/29/07 07:59 PM

go to the degree circles at the top of reflector page. very easy to install.

--------------------
Keith

Zhumell 10" dobsonian with $12 "Push-To"
4mm & 9mm BO/TMB Planetary, 13mm Stratus, 17mm Stratus, 32mm Widefield
Orion shorty plus 2x barlow
Catseye Xl Triple Pro Pack
Glatter Laser
Celestron 15x70



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neoweb
Pooh-Bah


Reged: 12/10/06
Posts: 1482
Loc: UK
Re: Push-to circles/setting circles for Dobsonians? new [Re: kwalker]
      #1391677 - 01/29/07 08:10 PM

Now why didn't i see that earlier! Thanks, Keith.

--------------------
Celestron StarHopper 8" f/6 Dob
38mm Burgess 2" SWA | 30mm Ultima | 20mm Omni
17mm Hyperion | 12.5mm Baader Ortho
8mm TV Plossl | 6mm TMB/BO Planetary
Orion Shorty Plus barlow
15 X 70mm Skymasters

Saturn-like: desktop image


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Anonymous
Unregistered




Push-to circles/setting circles for Dobsonian new [Re: neoweb]
      #1398013 - 02/01/07 09:59 PM Attachment (91 downloads)

I just modified my 8" Starhopper with manual setting circles. I used the 19" diameter pdf found here on CN for the azmith. Staples printed and laminated it for $6 (don't use Kinko's they quoted me $30 for printing) . I then routed a 1" 3" window on the base on the top board of the dob base. I located the window on the eyepiece side of the base for easy viewing. I put a mark on the base board in aligment with one of the three legs and I position this side north when I use the telescope. The scale is placed on the base board so when the marked foot is north, zero degrees is on the side below the eyepiece so I don't have to move. I used 3M spray adhesive to keep the laminated scale where I want it. To get correct aligment, I place the marked (north) foot north at polaris. Being exact does not matter beacuse I then point my telrad or finder scope on polaris and then calibrate to zero with an adjustable (clear plastic) indicator that has a 20 dergree range. I also, level the scope so as I rotate the scale remains accurate. http://i146.photobucket.com/albums/r269/dehrenberg/IMG_0177.jpg For the altitude I use the following digital level. http://www.wixey.com/anglegauge/index.html
This is much more accurate and eaiser to use than a dial inclinometer or a printed degree scale for the altitude and is only $40.


Doug

Edited by dehrenberg (02/01/07 11:10 PM)


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csa/montana
Den Mama


Reged: 05/14/05
Posts: 76331
Loc: montana
Re: Push-to circles/setting circles for Dobsonian new [Re: ]
      #1398137 - 02/01/07 11:02 PM

eaiser to use than a compass for the altitude. (Quote)

We have been using inclinometers for the altitude; some digital, not compasses.

Carol

--------------------
Carol


AstroTech 16" Dob (Thanks ASTRONOMICS!)
Vixen 80MF
Masayumas 7.5,15,25W,35
Pentax XW5,10; XL7
TV22Pan
ES30
Paradigm 8,12,18

DreamCatcher Dobservatory



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jayscheuerle
Post Laureate


Reged: 01/16/06
Posts: 4675
Loc: S. Philadelphia, PA
Re: Push-to circles/setting circles for Dobsonian new [Re: csa/montana]
      #1398747 - 02/02/07 10:05 AM

I just did a search on the Wixey angle gauge and it turned up favorable reviews in wordworking magazines, citing its .1 degree of accuracy being reliable. I contacted them to find out if the device retains its "zeroed" setting while off, and it does, so set it once to horizontal and let it go. It's 2" x 2" x 1.3".

Seems like an excellent deal to me. - j

--------------------
Fight indignorance!

120ED, 12" f/5 Green Goblin, 6" f/5 Eero2, 4.5" f/8 PortaBowl, 8" f/5 Big Red Ed.

The PortaBowl-a $100 4.5" f/8 ball-scope YOU can build!


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csa/montana
Den Mama


Reged: 05/14/05
Posts: 76331
Loc: montana
Re: Push-to circles/setting circles for Dobsonian new [Re: jayscheuerle]
      #1398762 - 02/02/07 10:13 AM

Much less than the Sears digital @ $99! I was fortunate to pickup a used Sears digital for $35, but it is longer than this one.

Good find Doug! I'm putting a link to it in my thread on the Degree Circles, thank you, & I know you will enjoy the setup!

Carol



--------------------
Carol


AstroTech 16" Dob (Thanks ASTRONOMICS!)
Vixen 80MF
Masayumas 7.5,15,25W,35
Pentax XW5,10; XL7
TV22Pan
ES30
Paradigm 8,12,18

DreamCatcher Dobservatory



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rnabholz
scholastic sledgehammer


Reged: 07/25/04
Posts: 923
Loc: Iowa
Re: Push-to circles/setting circles for Dobsonian new [Re: ]
      #1399021 - 02/02/07 12:22 PM

Welcome to the club.

That $40 digital inclinometer looks to be a great find. Nice small footprint and I suspect relatively light weight with mounting magnets. That is a very nice and affordable alternative to the $100 Smarttool.

Well done.

--------------------
Rod Nabholz
Home Built Astronomy Projects
Wild Bird Photography


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