v 2.0 (2009) of Pisapapel.blogspot.com
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| De flisol2009 |
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| De flisol2009 |
| The Galileoscope ™ is a refracting telescope or refractor: a long tube with a large target (the target) in the front and a small lens (eye) on the back end. The great Italian scientist Galileo refractor telescopes are, too, but improved to 400 years Galileoscope design in several important respects, as described below. Galileoscope costs U.S. $ 15 each (1 to 99 units) or U.S. $ 12.50 each (100 units), plus shipping, which comes in a cardboard box measuring 19 ½ by 6 ¼ by 4 ¼ inches (49.5 by 15.9 by 11.1 cm) with a shipping weight of 2.6 lbs (1.2 kg). Here are the key instrument of the optical characteristics: Objective diameter: 50 mm (2 inches) Objective focal length: 500 mm (f/10) focal length eyepiece : 20 mm Magnification: 25x (50x with Barlow ) Field of view: 1 ½ (¾ ° Barlow) Ocular ocular: 16 mm (22 mm with Barlow) eyepiece barrel diameter: 1 ¼ inches (31 mm ¾) The field of view is the angular diameter the circle of sky you see when you look in the eyepiece of the telescope. The full moon is about ½ ° wide, so the Galileoscope field is three to 25x Moons wide, just large enough to cover the beautiful Pleiades star cluster in Taurus, one of the objects amazed Galileo 400 years ago. If you double the increase of 50x using the Barlow lens, the width of the visual field is halved. Eye relief is the distance behind the eye that is needed to put the eye to see the entire field of vision circular. The large eye relief Galileoscope 16 mm to 22 mm and 25x to 50x should allow anyone, including children, to observe comfortably with or without glasses. The last entry in the table is significant. We designed the Galileoscope to accept accessories with standard 1 ¼ inch barrel common to most commercial telescopes. This means you can replace your own eyepieces of different focal lengths for the supplied 20 mm eyepiece, giving you additional options for the extension and the field of vision. (The addition of a telescope is the lens focal length divided by eyepiece focal length in the same units, with a given objective, eyepieces with shorter focal lengths to give more powers, and vice versa.) Optical design Galileo built every one of their telescopes with convex (magnifying) objective lens and a concave (demagnifying) ocular lens. This combination produces an image that is both the right and correct left to right, but the narrow field of view is uncomfortable - as if you're looking at the sky through a straw. Contemporary Galileo, German astronomer Johannes Kepler showed that with a convex lens ocular refractor produces a wider field of vision and comfort - it also turns the image upside down. This is not a problem for astronomy, however, because there is "up" or "down" in space. (Kepler is remembered for his three laws of planetary motion, the first two of which were published in Astronomia Nova in 1609, the same year, Galileo turned his telescope to the heavens. IYA2009 Galileo celebrates not only pioneering contributions to astronomy 400 years ago, but Kepler). Unique among the equipment available telescope, Galileoscope can be mounted in a Galilean or Keplerian configuration settings so you can compare the two designs for yourself. The Galileoscope is really two telescopes in one! lenses just do not bring all colors of light of a common approach, as Galileo and Kepler telescope showed spurious color fringes around the moon, planets and bright stars. This is called chromatic aberration, or false color. In early 1700 Optical imagined that could minimize this problem by using pairs of lenses of different materials, each of which partially corrects the chromatic aberration of the other. Such pairs of glasses are called achromats. The Galileoscope of 50-mm f/10 achromat objective lens is made from two types of glass. The 20-mm (25x) eyepiece uses two achromats - a total of four lenses - made from two types of plastic. These four elements of the configuration is similar to the popular Plössl eyepiece, a high quality of design rarely seen in any telescope costing up to $ 100. addition to the main eyepiece, the Galileoscope comes with another achromat plastic that can be used in two ways: as a 17x eyepiece in Galileo's own or as a 2x Barlow lens to double the magnification of 50x for Keplerian Galileoscope in normal settings, as described below Accessories. Mechanical Design Galileoscope We designed so it can be assembled in 5 minutes or less in young children with adult supervision. Assembly requires no tools, no glue, tape, and no - everything fits into place easily. As already noted, the goal of Galileoscope has two achromat glass lenses. Is treated as a single unit with the two elements stuck. The double of two plastic parts for major achromats eye, and the two plastic components for the Galileo achromat Ocular / Barlow Lens, lenses look like, so that the six pieces. Except as noted below, all other parties Galileoscope kit are made of ABS plastic, durable material used in injection molding. This is the complete 30-piece parts list, working approximately from the front (heaven) end to the back (eye) final: | |
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