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These are refractor-based optical systems that use special filters to view specific wavelengths of light the most common of which is H-alpha. Using H-alpha allows safe observation of the entire solar disc providing superb views of prominence's chromosphere's and surface details such as sunspots plagues flares filaments and granulation.
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Based on observations made with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute which is operated by the Association of Universities for Research in Astronomy Inc. under NASA contract NAS 5-26555. These observations are associated with programs GO-13817 GO-14336 and GO-14773.
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telescopes (from 6–10 m) at the expense of smaller telescopes (from 1–4 m) is a poor allocation of resources. (Telescopes are typically compared to one another by the diameter of their primary mirror which in this article will be measured in meters; one meter is approximately equal to 3.28 feet.) 23
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The amateur astronomer used to have a relatively basic choice of equipment: a refractor (see REFRACTING TELESCOPES) or a Newtonian reflector (see REFLECTING TELESCOPES); there were few other options. The refractor has always been the stereotype astronomer's instrument: a spy glass with a lens at one end and an eyepiece at the other.
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