the opening of the largest telescopes are reflectors, since they need?
Need a little help of telescopes. Can you fill the blank? Greater openness telescopes, requiring a focal length * empty. The problem with a halo of color around an image formed by a simple lens is called? Thank you if you can help.
The first question is poorly written. Most telescopes are required due to the large diameter today by researchers. It is much easier to support the glass mirror in the back, because light bounces off the surface. Refractors (those use a lens) are limited to 40 "in diameter and weight of the glass is supported by its edges and collapse. distorts the image of the object you are viewing. telescopes can be almost any focal length.
Which is better? 80 AT BB Meade ETX or Celestron AstroMaster 130 EQ?
I'm searching for a "good beginning" telescope … and I would like to have a reasonably good view of the planets and galaxies. Meade makes me think of the portability and small footprint (that I have a lot) and I think Celestron Thank you for your response Andrew … I live in California … and right now the weather is not so bad.
I see that once again the purchase of a brigade are Dob force and completely failing to answer your question. A Dob is certainly an option, but not unique. To learn how to locate objects yourself a Dob is not the best option as the true only method available is star hopping. Which of these two areas in particular is best depends on several factors. Where are you watching? If it is a light contaminated equipment can make life much easier and the benefits of greater openness which decreased slightly. Get out and have a look the sky is night. A quick test is the sword of Orion. It must be a direct object easy viewing with the naked eye. If it is difficult to distinguish remotely then light pollution is very serious and I would suggest then later opening observation to make your experience more rewarding. Not sure that the scope is the best option though: although I'm not familiar with this particular area and usually make good Celestron areas, the focal ratio is quite fast and the weight seems clear (read weak). I would be willing to a longer focal ratio (f/7-f/8) and heavier scope. ETX. This is a
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Meade ETX60AT Telescope (Obsolete) $450.00 TE2) ETX-80AT W/AUTOSTAR & TRIPOD… |
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Meade ETX-80AT-TC BB (f/5) Achromatic Refractor Backpack Version $299.00 The Meade ETX-80BB Backpack Observatory Telescope is an unbelievable 12 lb in total, including the tripod, and comes with a sturdy backpack carrying case that fits both the telescope and its accessories. With its incredible 80mm objective lens and built-in motor, you don’t have to sacrifice quality for portability. The Meade Telescope ETX-80 is a must-have for traveling astronomers. This Discover… |
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Meade ETX-TC Telsescopic $250.80 The compact and portable design of the ETX-80AT-TC Refractor Go-To Telescope will have you out observing the inexhaustible quantity of visible phenomena in no time. The ETX-80AT-TC double-tine, fork mountings include high-torque DC motors on both telescope axes, permitting electronic operation from the included plug-in AutoStar hand controller. You can instantly select any spe simply by pressing t… |
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Meade ETX-80BB Backpack Observatory Telescope – 0805-04-20 Shop for Telescopes from Telescopes.com! In addition to the exceptional features of the Meade ETX-80AT-TC Telescope the BackPack version has a slightly lighter field tripod with bubble level indicator and a special edition Meade backpack. This model is perfect for camping and quick grab-and-go astronomy trips. We recommend this version for travel use due to the lighter weight of the tripod. Meade’… |
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