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General Astronomy >> Beginners Forum

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Jeff2011
Pooh-Bah
*****

Reged: 01/01/13

Loc: Sugar Land, TX
Re: A few ?'s about my new 8" dob new [Re: Haas]
      #5686187 - 02/17/13 11:30 PM

Haas,

I started by using my iPhone app distant suns and later sky safari. I had a hard time initially reading star charts although I can read them now. I still use my red dot that came with the scope. With the smart phone apps you can size the screen to match your field of view. Point the red dot at a visible star and go from there. One word of warning is that the image in the scope is upside down and backwards. This can be very frustrating at first, but you will get used to it with practice.


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Jeff2011
Pooh-Bah
*****

Reged: 01/01/13

Loc: Sugar Land, TX
Re: A few ?'s about my new 8" dob new [Re: Jeff2011]
      #5686196 - 02/17/13 11:37 PM

One more thing. Finding objects became a whole lot easier for me when I bought my wide angle eyepiece. It is a 38mm orion Q70 that has a true field of view of 2.2 degrees for my scope. That is twice that of the 25mm eyepiece that came with the scope. To put that into perspective, it is over 4 full moons.

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TexasRed
scholastic sledgehammer


Reged: 05/17/11

Loc: East Texas
Re: A few ?'s about my new 8" dob new [Re: Jeff2011]
      #5686281 - 02/18/13 12:31 AM

I don't like contorting my neck to try to look up the tube, so I use a 9X50 RACI finder. To get the scope in the general area, I just shine my green laser pointer into the eyepiece of the finder. That gives me a bright green line of light into the sky pointing very close the the same place as the telescope.

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Allan...
sage


Reged: 10/24/12

Loc: Penticton B.C. Canada
Re: A few ?'s about my new 8" dob new [Re: TexasRed]
      #5686326 - 02/18/13 01:12 AM

Texasred, you told us that a while back....and I had forgotten it. I need to do that; get a green laser and try that with my 9x50 RACI, before giving up on it. I could keep it in my pocket if its cold out to avoid the laser cold problems. thanks, Allan

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Peshmerga
member


Reged: 12/25/12

Re: A few ?'s about my new 8" dob new [Re: Allan...]
      #5686374 - 02/18/13 02:38 AM

Quote:

I have a 9x50mm Right angle finderscope and find it a little difficult to use;




I got an XT8i here, came with a RACI 9x50 finderscrope. First, make sure both scope and finderscope are aligned. If not, align on Polaris, since it's stationary, or any bright star or planet if Polaris isn't available.

My technique to align for the RACI finderscope/find object in RACI finderscope is to stand closely behind the dob. Raise your hand into the air, point at the object of interest, then slowly lower hand till go past the same height as your finderscope. You are drawing an imaginary line that's straight down from the object of interest. Use whatever is in your view, background, foreground to visually mark this line. You then want to move your dob so that the finderscope's tube intersects this imaginary line. Now lower the dob's altitude a bit so you can start scanning from low, or near the horizon. Keep raising the dob slowing and the object of interest should appear in the ~5° view of the finderscope.

A cheap green laser pointer might help. Just make sure it is warm, too cold, the beam weakens. Place the laser parallel against the finderscope base. Beam on, aim, move dob, point at object, check finderscope, should be close.


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BigC
Carpal Tunnel
*****

Reged: 09/29/10

Loc: SE Indiana
Re: A few ?'s about my new 8" dob new [Re: panhard]
      #5686762 - 02/18/13 10:37 AM

You just described my procedure as well:telrad,RACI,scope tube.

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newtoskies
Pooh-Bah


Reged: 07/15/12

Loc: SE Ma.
Re: A few ?'s about my new 8" dob new [Re: BigC]
      #5686770 - 02/18/13 10:49 AM

Well Haas, basically what the other said.
I bought the Rigel for both my scopes but haven't had a chance to use it yet.

As for ep's, the Paradigm's are great, and so are the TMB's. Both are reasonably priced too.


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Madratter
Post Laureate


Reged: 01/14/13

Re: A few ?'s about my new 8" dob new [Re: newtoskies]
      #5686804 - 02/18/13 11:14 AM

My preference on a Dob is to have both a Telrad and a right angle finder. Unfortunately, my right angle finder recently broke and I was stuck with "just" the Telrad. Using just the Telrad the other night I ran down 22 Messier Objects and 8 other NGC objects in about 4 hours. So if you learn to use them they can be very effective.

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kenrenard
Carpal Tunnel


Reged: 12/13/12

Loc: Dunmore, PA
Re: A few ?'s about my new 8" dob new [Re: Madratter]
      #5686946 - 02/18/13 12:43 PM

Here is a good Telrad chart for all the Messier.

It may be helpful.

http://www.atmob.org/library/member/skymaps_jsmall.html


Ken


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Billytk
scholastic sledgehammer


Reged: 04/22/12

Loc: Lake Mary, Fl.
Re: A few ?'s about my new 8" dob new [Re: kenrenard]
      #5687466 - 02/18/13 06:02 PM

Here is a link to Orion's Laser finder.

http://www.telescope.com/Accessories/Telescope-Finder-Scopes/Orion-SkyLine-De...


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Tim D
super member


Reged: 10/08/10

Loc: Temecula, CA
Re: A few ?'s about my new 8" dob new [Re: Billytk]
      #5687822 - 02/18/13 09:09 PM

I used a Telrad and a Q70 32MM Eyepiece for 3 years on my 8" Dob for finding all my objects, it worked great and kept it real simple and cheap with a manual Dob.
Tim


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Tank
Carpal Tunnel
*****

Reged: 07/27/09

Loc: Stoney Creek, Ontario, CANADA
Re: A few ?'s about my new 8" dob new [Re: panhard]
      #5687873 - 02/18/13 09:42 PM

A telrad and a right angle finder scope is a perfect setup for a DOB.

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