depends on what planet your looking at
most scopes sold can see jupiter, saturn mars and venus pretty well. I'd say your pretty safe with the DS-2090MAK.
I don't own one though.
yes, I've read reviews on the scope and they do claim to see all planets pretty well and even galaxies..... so its got some range.
dose is "does"
and good should be "well"
2007-12-27 15:19:23
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answer #1
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answered by Mercury 2010 7
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You won't get much with $50. I'll put that aside for the sake of discussion. Others will have more experience with eyepieces in a refractor, so I'll just tell you that a barlow lens doubles the power of the eyepiece you're using (if it's a 2X barlow; some are 3X), while giving the same "eye relief". This means the eyepiece doesn't become more difficult to see through, which happens when you double the power by using an eyepiece with half the focal length (e.g, using a 20mm eyepiece is more comfortable than a 10mm eyepiece. Though the 10mm gives double the power, it also has a smaller field of view and you must have your eye much closer to the eyepiece. Using the 20mm with a 2X barlow doubles the power while not causing the problems as much). For this reason, if you do buy 2 eyepieces and a barlow, make sure that one eyepiece isn't double the other. Putting the barlow in the lower power one will just give you the same magnificatin as the higher power one, which is a waste of money. If they're not in the proportion 2:1, then you effectively have four eyepieces if you have a barlow. A zoom eyepiece may seem convenient as they can provide a variety of focal lengths, say from 24mm down to 8mm, but they are a compromise where viewing quality is concerned. Sorry, it's late here, but I hope that's useful.
2016-05-27 09:34:16
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answer #2
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answered by ? 3
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If portability is your main concern, the Maksutov type of Telescope will give you an image almost as sharp as a Refractor.
A 90mm instrument is a good starter size for solar system observing and will reveal some of the brighter nebulae, clusters and galaxies as well. But the Maksutov is also the most expensive of the commonly available Telescope Types.
You could purchase a larger Refractor for the same price, but it would not be as compact as the Maxutov with the same focal length.
With this size of instrument it is important to get a long focal length. The focal length determines the size of the prime image which is then magnified by the eyepiece. If the focal length is too short, you would have to use very high magnification to see any details on planets. This figure is limited on a small instrument by the diameter of the objective lens.
Adolph
2007-12-27 21:24:11
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answer #3
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answered by Adolph K 4
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It's a little small, but, yes, it will show planets. Any reason for this particular scope?
The recommendation, repeated ad infinitum around here, is to hook up with local astronomers and have a look through their telescopes first.
Be advised that astronomers have zero tolerance for poor spelling and grammar.
2007-12-27 16:39:12
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answer #4
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answered by laurahal42 6
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This one will do at least as well and likely much better. Unlike scts the refractor has no center obstruction, it easier to collimate, and this one gives you a bigger objective lens 102mm for about the sme price.
http://www.opticsplanet.net/celestron-omni-xlt-102-telescope-refractor-21088.html
2007-12-27 15:31:23
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answer #5
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answered by n2s.astronomy 4
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