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Just Bought This

Need our opinion on a telescope Optics Planet has on sale, go ahead and ask! Post some hints and tips on various telescope brands and configuration.

Just Bought This

Postby czbill on Wed Feb 16, 2011 1:13 am

I just bought this reflector telescope. It has absolutely no markings on it except the sizing label. Can anyone offer any information on who might be the maker? It is old, but seems to be in good shape.

Thanks.

http://spacecoast.craigslist.org/sys/2192368251.html
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Re: Just Bought This

Postby Jne_K on Wed Feb 16, 2011 11:08 am

As I read it, Seben is the manufacturer. As to the scope, I would say it is a very typical reflector in this size range, most likely made in China, as are nearly all reflectors at this price. That is not necessarily a bad thing at all, especially if you want an affordable scope with enough aperture to be useful. If you can get it for a good price, should make a good starter scope.
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Re: Just Bought This

Postby Pathik on Thu Mar 10, 2011 4:07 pm

I just bought one of the 6" Bushnell Dobsonians - do you have any recommendations for eyepieces? I'm interested in starting out with some lunar and planetary observation, and not sure where I'll go from there (sky's the limit right? haha)

I've seen that a "3x barlow" is recommended on some other forums, but I haven't looked up what that exactly means. Any insight will be appreciated.

Thanks!
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Re: Just Bought This

Postby Jne_K on Fri Mar 11, 2011 11:21 am

Hi

The eyepieces that come with the Bushnell Dob are actually quite useable, as beginner eyepieces go. Assuming you got the 6", the SPL10 and SPL25 eyepieces get you 120x and 48x, respectively. That's not a bad spread and will cover most of your deep-sky observing. Planets and the moon can handle more magnification, but DO NOT go overboard on magnification. That is the number one beginner's mistake. Although the optics can handle a bit more under good conditions, I would not go over 200x on a Dob, at least at this point. The Dob mount is really at its best at low and medium powers. Besides, 200x is more than enough for good views of planets and, above 200x, you start to run the risk of poor seeing conditions ruining the view.

A 3x barlow is not a good idea for beginners, precisely because it too often puts you right in that too much magnification arena. For instance, a 3x barlow with that 120x eyepiece gets you a pretty useless 360x. With the 48x eyepiece, it gets you 144x and that is not enough of a step up over 120x to be worthwhile. A 2x barlow would be more practical, here, but 240x is still going to be too much on nights of marginal seeing conditions. If this was my setup, I would go for a third eyepiece, rather than a barlow. A Celestron X-Cel LX eyepiece in 7mm gets you a conservative, but very useable 170x as your maximum power eyepiece.

For more on eyepieces, see my article Telescope Eyepiece Questions
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