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Thread: Sky watcher 12 inch dob questions

  1. #11
    Brian12345's Avatar
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    Default 12" Dob Suggestion : Poor-Man GOTO



    Here is a simple suggestion for Sky-Watcher or similar dob users who don't have GOTO.

    Add an azimuth scale as shown in the photo.

    To use it , align the pedestal to true north using Polaris or a compass. Put a marker/stake etc. in the ground at the 360 degree indication on the scale ... done ... then rotate the pedestal to the desired azimuth for viewing , using the marker/stake as the reference point.

    Buy a $40CAD Wixey digital angle gauge. It has a very strong magnet which will hold on the steel tube nicely.

    Use any of the software programs such as Stellarium which provide Azimuth/Altitude (elevation angle) and you have a low cost manual GOTO
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  2. #12
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    Default

    Brian, the teeth on your RA seem to be a bit uneven
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    /wide field scope. 10x10 shed with dome. Sky watcher sky adventurer mount.

  3. #13
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    Default

    i have the 8" flextube auto track.
    and i love it,superb build quality and finish.
    no bits of particle board on the base that need to be sealed.
    optics excellent,collimation a cinch.
    very quick set up,easy to use.the list goes on.
    two low points,the finder is adequate but not great,
    and the alt scale is about 3 1/2 deg out,but thats no big deal.
    all in all,a great package for the money.
    clear skies,
    andy

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    andy

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    to the sky.
    ARCHAEOLOGISTS WILL DATE ANY OLD THING

  4. #14
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    Default

    Hello everyone. I own a 6'' reflector and bought a 12'' Dobsonian (Orion) last December. Guess which telescope gives clearer images? I'm pretty disappointed in the Dobsonian. Maybe it's just the collimation, but last night Saturn was even more fuzzy with higher powered eyepieces in the dob than with the smaller reflector telescope. The dob is also much harder to carry around and point to whatever you want to look at. If I can't get this problem fixed, I'll try and trade the dob in for giant binoculars or maybe a reflector. I don't think it's the collimation because I see Saturn as it should be, it's not a double image or anything, it just gets more and more fuzzy with increasing the eyepiece power. Believe it or not, I get a clearer image in the 6" reflector with a 7 mm eyepiece than I get with a 10 mm eyepiece in the 12'' dob. Really disappointed...

  5. #15
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    Default

    Quote Originally Posted by richj8990 View Post
    Hello everyone. I own a 6'' reflector and bought a 12'' Dobsonian (Orion) last December. Guess which telescope gives clearer images? I'm pretty disappointed in the Dobsonian. Maybe it's just the collimation, but last night Saturn was even more fuzzy with higher powered eyepieces in the dob than with the smaller reflector telescope. The dob is also much harder to carry around and point to whatever you want to look at. If I can't get this problem fixed, I'll try and trade the dob in for giant binoculars or maybe a reflector. I don't think it's the collimation because I see Saturn as it should be, it's not a double image or anything, it just gets more and more fuzzy with increasing the eyepiece power. Believe it or not, I get a clearer image in the 6" reflector with a 7 mm eyepiece than I get with a 10 mm eyepiece in the 12'' dob. Really disappointed...
    What kind of Dob is it? Also, large aperture Dobs need to be collimated perfectly to give nice clear views, and they are usually about f/5, so they also need good eyepieces. I collimate my 12 inch collapsible Dob every time I transport it anywhere.

    I was out last night at the SDAA dark site near Tierra del Sol (TDS) and although the 22 inch Lipp Ritchey-Chretien reflector at TDS (Tierral Del Sol Dark-sky Observing Site) has a much brighter view than mine, my telescope was doing a better job of resolving the stars in globular clusters like M3 and M13. Since the 22 inch was using 31 mm Tele Vue Nagler and I was using my Explore Scientific EPs, IMO the difference must have been the mirrors or the collimation (I know mine was spot on).
    Last edited by samgray1; 05-01-2011 at 06:53 PM.
    Name: Sam
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    12” Collapsible Dob w/Telrad, Explore Scientific 30mm 82*, and 20mm, 14mm, & 9mm 100* EPs, Tele Vue 4X Powermate & Paracorr T2, 2" Lumicon UHC and ND13 (
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    ) Filters, 2" Astronomik OIII filter, dew heater system, and Nikon Action 7x50 EX Extreme ATB 6.4* binoculars & Celestron 15x70 binoculars.

    I'm enjoying learning the sky by star hopping; just charts, my binoculars, and my Dob!

  6. #16
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    Default

    Hey Sam. This is an Orion 12'' Intelliscope, with "push-to" tracking. Something is wrong with the horizonal tracking; it won't move much either way from 168 degrees. Vertical tracking is fine. I don't think I really need to use the Intelliscope program anyway, since I have a couple of decent online star charts to reference.

    The big problem is of course light pollution in the city. I still have not taken out the dob to a relatively dark area and see what it can do yet. However, (and say what you will about this) when I'm in the city and compare a 6" reflector with a 12" dobsonian, the only difference is that the 12" dobsonian has brighter images. There is no difference in clarity or sharpness; in fact if anything the 6" reflector is a bit sharper. So, head to head with moderate light pollution, the 12" dob, which costs $800 more, is not superior at all.

    Now, in darker conditions, maybe the dob will finally "shine" compared to the much cheaper, much easier to transport, and much easier to use 6" reflector (also an Orion, Starblast 6.0). When the moon wanes toward new in a few days, I'll try to go into the mountains and use the dob, but for now, it certainly was not worth the $1100 I paid for it. Maybe I'm naive, but I thought that 4x more light collection (compared to the 6'')would mean 4x resolution of fainter objects. This simply has not happened in conditions of moderate light pollution.

  7. #17
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    Default

    We recently had a discussion on the subject of aperture vs. light pollution and you’re supporting the point I made on the subject, which is a larger mirror gathers more light from the target, but also more of the light pollution. If your optics are clean and correctly collimated, you will love the difference that a dark sky makes. Instead of seeing your targets against a bright grey background, you’ll be seeing them just as bright, but against a dim grey background—giving you the contrast you need to see the dimmer parts of your targets, basically a larger area of the brighter galaxies, galaxies that you couldn’t even find in the city, nebulae you couldn’t even find in the city, etc.

    But before you go out to a dark site, do yourself a big favor and get used to collimating your telescope. With a 12 inch telescope you should be at least checking it every time you transport it anywhere. It is really easy to do once you get the hang of it and necessary to ensure you get optimum performance from your telescope.

    Here are some links for you:
    Aperture and light pollution

    [ame=http://www.youtube.com/watch?v=YAVGcGEBmCE]YouTube - How to Collimate a Telescope - Orion Telescopes and Binoculars[/ame]

    The last part of the collimation video shows you the easy way of collimating, which is to use a laser collimator. This is all you need to learn if you have (or purchase) a laser collimator.

    Good luck and clear skies.
    Name: Sam
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    12” Collapsible Dob w/Telrad, Explore Scientific 30mm 82*, and 20mm, 14mm, & 9mm 100* EPs, Tele Vue 4X Powermate & Paracorr T2, 2" Lumicon UHC and ND13 (
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    ) Filters, 2" Astronomik OIII filter, dew heater system, and Nikon Action 7x50 EX Extreme ATB 6.4* binoculars & Celestron 15x70 binoculars.

    I'm enjoying learning the sky by star hopping; just charts, my binoculars, and my Dob!

  8. The Following User Says Thank You to samgray1 For This Useful Post:

    deaman49 (05-29-2011)

  9. #18
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    Default

    Quote Originally Posted by richj8990 View Post
    Hello everyone. I own a 6'' reflector and bought a 12'' Dobsonian (Orion) last December. Guess which telescope gives clearer images? I'm pretty disappointed in the Dobsonian....
    What you have there is a 6" reflector and a 12" reflector... the "dobsonian" part refers only to the mount and has no effect on the view, other than to keep it stable. In all likelihood, more stable than the tripod achieves with your 6".
    There is something wrong. There's no way that your 6" reflector could trump the 12" reflector if the optics are good and collimation is done properly. The Orion Intelliscope has good optics. Not seeing a "double image" is not an indicator of good collimation. Off hand, I'd guess that the collimation is badly out on the 12".
    Last edited by GriffinBF; 05-14-2011 at 04:42 AM.

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    Default Re: Sky watcher 12 inch dob questions

    I had xx12i, and the optics were not what I was expecting. I sold it.

  11. #20
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    Default Re: Sky watcher 12 inch dob questions

    Asking if a this question on a Skywalker forum is going to give you biased answers as most people here won't have experience with every scope, but however I have experience with 2 one was a 200mm home made scope and a 250px skywatcher the Skywatcher was better on every level, it also has a Pyrex mirror which has better thermal qualities than the Meade glass mirrors. Go for 5he Skywalker you won't be disappointed

 

 
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