| 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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eye Galileo: Included in the kit is a custom Galileoscope consisting of a plastic accessory two element achromat with a two-piece plastic holder, a plastic ring and a plastic tube. The lens has a focal length of 30 mm negative. This accessory can be used in two ways. If we set up without the tube, you get a Galilean eyepiece gives 17x and an increase in right field of vision of less than ½ ° wide. With this eyepiece, you can make the most frustrating "Galileo experience" to see in the heavens a very small piece at a time. This will really appreciate the progress represented by today's designs wider field!
2x Barlow Lens: If instead to assemble the parts using the tube, you get a 2x Barlow lens, which, when used with regular eye offered increases the gain of 50x Galileoscope. In addition to providing more detailed views of the Moon, Jupiter, and other targets, Barlow explained the rings of Saturn. When Galileo looked 20x to 30x, you can not find enough that I was watching a ringed planet Saturn - described as "triple form."
Tripod: As an experienced stars know, a telescope is as good as its installation. Because a telescope provides a magnified view, the smaller the vibration is like a major earthquake in the eye. Even at a relatively modest 25x, the Galileoscope must be securely attached to something stable. Because the instrument is so light, cheap photo tripod - the kind found in most discount stores - should be sufficient. The tripod must have a pan gently moving his head high (up-down) and azimuth (left to right), so you can aim the telescope at any place in the sky and make small adjustments without shaking things.
Photo tripodThe including ¼ -20 mounting nut on the underside of the Galileoscope fits any standard photo tripod, and if you already have this type of installation, that's all. We are not a package with tripod Galileoscope, but you can find models from manufacturers such as Vanguard, Sakar, and Tiffen (Davis and Sanford) for less than U.S. $ 20 Internet. If you are using the Galileoscope while standing - sitting in a chair is more comfortable! - We recommend that you put on a tripod that extends to a height of at least 60 inches (150 cm). Otherwise, you will find difficulties in their heads in the eyepiece of the telescope when there was high in the sky. If you prefer, you can use a shorter tripod, or even higher-a tripod table, placing a star on the diagonal between the focuser and eyepiece.
Shipping Rates Rates are based on the mail or parcel service. If you buy 100 or more Galileoscope, you'll save money if we send your order for freight service, which requires ordering by e-mail or telephone. So, instead of a big order on this website, we recommend that you complete our Quote Request form and send it by e-mail to freight@galileoscope.org. We will respond with a quote on shipping freight service and the instructions to order "offline" and save money on shipping. To large institutional orders, we accept payment by purchase order, please check the appropriate box on the Request for Quotation. Sorry, but we can not accept purchase orders from individuals, all orders must be paid using a credit card or PayPal. For more information, including links to currency converters, see our Customer Service.
For information on how you can donate Galileoscope children, parents and teachers around the world who can not afford to purchase, at the special price of U.S. $ 12.50 each, free shipping, please read about Have a Galileoscope our program.
You may have read or heard that U.S. Galileoscope cost $ 10 each. That was our target price, but it is just that: a goal. The higher the final price of $ 15 each in small quantities and $ 12.50 each in large quantities (plus shipping) remain important for a telescope of this quality and versatility. One of the reasons we do not end up under $ 10 is that the global economic crisis increased our manufacturing and distribution costs beyond our original estimates. But in truth, the main reason why the final price above $ 10 is that we Galileo decided to include the eyepiece / Barlow lens as part of the core team and not separately priced as an optional extra. We did this because we believe that the additional part that only Galileoscope very suitable for education (as they can be mounted on a Galilean or Keplerian configuration) and inspiration (as can clearly reveal the rings of Saturn with a 50x increase). You are effectively getting two telescopes for the price of one - quite a bargain!
Note also that we have developed for astronomy education and outreach Galileoscope, not for profit. Price of the kit we recover our costs, adding no margin. We have created Galileoscope, LLC, so we could sell telescopes directly to the astronomical community worldwide, for "the elimination of middle man", also remove the extra charge associated with a link in the chain. Moreover, almost everyone involved in the project is a volunteer, working in the Galileoscope also make your "day job." In short, the Galileoscope is a labor of love, not for profit commercial company.
Why a new telescope kit?
The International Astronomical Union brochure and website IYA2009 ask, "Who does not remember the first time which looked at the moon through a telescope and were amazed by the details of the mountains and craters? The same applies to the cloud belts of Jupiter and its fascinating Galilean moons, the rings of Saturn and bright star cluster. This question has a simple and obvious answer: "Anyone who has never had a chance to look through a telescope! "Especially for those who can not afford to buy even a small department store telescope, a DIY Galileoscope could be the key to pursuing an interest in astronomy beyond IYA2009.
As a first step in the Galileoscope project probed The current market for low-cost telescopes and telescopes preassembled kits, many of which are marketed as toys. We found dozens of different models from different suppliers and each sampled for evaluation. Most of them have had problems like these:
* The lack of expansion for astronomy (eg 3x)
* False color and other optical aberrations
* Small aperture or stopped down
produces images * Very low narrow fields of view (<1 °)
* Unstable mounting, unmounted, or any way to connect to an assembly
* Poor, missing, or ambiguous instructions
mounting
therefore set out to design a new telescope kit from scratch, a small telescope to redefine the education and include features usually seen only in commercial tools cost 10 times as achromatic lenses, lost control aggressive light, and a 1 ¼-inch focuser. We believe we have succeeded! The Galileoscope allows children of all ages to build and observe with a telescope similar to (but much better) than Galileo. Sharing these observations with the largest possible number of people, and encourage parents, teachers, students and others to believe in its importance, it addresses one of the main goals of IYA2009: Promote widespread access to new knowledge and observing experiences.
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