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Planetary Viewing, Imagine Brightness & Aperture

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Posted by Scott Nelson on June 15, 2003 16:19:32 UTC

Right now I live in a larger city, and don't have much opportunity to get out of town to a dark site, so I am seriously considering just going with a refractor and doing some planetary viewing in town. At least for now. Someday maybe I can invest in, or even build, a larger Dob for looking at the deep sky stuff when I have more time to do it.

One thing though. When compared to a 5 or 6" refractor, does the large aperture of a Dob make much of a difference in how bright the planets appear? Since the planets are close and are pretty bright already, would they still be about as bright and detailed with a 5" refractor at 300X as they would be with a 12.5"-16" aperture dob at 300X? If that's true, would there also really be little or no difference in planetary images between the 5" and 6" refractor?

Thanks again for your help, I am close to taking the plunge and getting my first scope. :->


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