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Dobsonians

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Dobsonians

Postby Guest on Wed Dec 16, 2009 4:08 pm

I have read that the Dobsonian telescope is powerful(but heavier) for the money. Is this true, since you only sell one brand of them? Are the Dobsonians more sturdy, require less collimation and have a wider view? Is the alt-az mount difficult to use if following an object? Would a 6" Dobsonian in reality, allow you to see more than the Meade 114EQ or Celestron 130EQ or 127 EQ or Konusmotor 130, considering light pollution and eyes over 40? Is a Newtonian motor useful or just an added expense? Will a telescope beginner looking to see detail on the moon and planets have an easier time with one of these telescopes? How does the focal ratio relate to a wider field? Is it better to keep a telescope in a cold garage or a warm house while not in use? Sorry for all the questions. I think I am on information overload! Thanks so much for your help!
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Re: Dobsonians

Postby Jne_K on Thu Dec 17, 2009 7:01 am

Hi

No, a Dobsonian is a standard Newtonian reflector on a special mount. It is no different in terms of optics than a standard Newtonian reflector. It is the mount that makes it a Dob, not the optics.

Any telescope can see those objects, but telescope size, in terms of mirror or lens diameter, is the main factor in telescope performance. A 6" scope, regardless of type, will see more objects and detail in those objects than a 114mm (4.5") scope. If you want to see more, you get a bigger scope. Don't make it any more complicated than that at this point.

Focal length is NOT something a beginner shoud use as a basis for buying a telescope. There is no better when it comes to focal length. A long focal length can be beneficial for some work, a short focal length for other work and, when it comes to beginner telescopes, manufacturers often artificially increse the focal length to add cheaper componenets, especially the mirror on a reflector. Scope size, otherfeatures and price is a better way to measure performance and quality.

A cold garage is better than a warm house. A scope needs to cool down to air temp before the optics are ready to use. Keeping the scope in a warm house just makes the process that much longer.
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