By Robert L. Clark

ISBN-10: 1441964142

ISBN-13: 9781441964144

The net Age is altering every little thing approximately human invention and using know-how. The swap has been in comparison to that of the advent of printing. Making your personal telescope isn’t what it was, both, thank you in part to the net. The outdated days of grinding and sharpening are long gone – except you need to do it! now you can gather a good device from a variety of cheap Internet-available elements, new or used. the web is the hot elements “junkyard,” with stuff from around the world so that you can decide via, day or evening. during this ebook you will discover out what’s usually to be had and the way to entry it. you'll how you can evaluation optical elements and mix them from various net assets. you'll get many rules on the way to make the components that you just don’t purchase or scrounge and the way to revive previous lenses and mirrors. and you'll study a few simple physics of designing ergonomic – cozy – telescopes. Navigating your approach round the percentages is straightforward utilizing this precious and well timed source. With Robert Clark’s assist you can get the easiest that the web has to supply. start now!

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That is, it will operate as a weak magnifying glass. As an individual lens it will have a focal length of about 2/3–3/4 that of the two components combined. The other component (the flint) is negative; that is, it is a reducing lens. In combination the flint cancels part of the power of the crown but also has a color “error” that reverses – cancels – the color error of the crown. That is why you don’t get the extreme color fringes that you got with the magnifying glass experimental telescope. The red end of the spectrum is folded onto the blue end, and the intermediate light ends up pretty much in the same place.

The average of the Messier objects is about 20 min of arc, and 20 min of arc is 2/3 of a Moon. Even if we exclude the three biggest we get about 1/2 of a Moon. Except for the smallest (in terms of angle subtended) Messier objects they subtend angles that would make them naked eye objects if they were bright enough. What we really need is light-gathering capability, not great magnification. 85 Note that most of these objects become less distinct as we observe them toward their edges, so the angles subtended are somewhat optimistic.

Most of the Lunar 100 (Charles Wood) objects are available. The main bands of Jupiter and the four Galilean moons can be seen with this little scope. The stripes and individual stars on a 3 foot by 5 foot American flag can be resolved (on a very clear day) at a distance of about 4 miles. Viewing anything through 4 miles of ordinary atmosphere has a lot in common with looking through a dirty aquarium. Because this telescope is one of the specific projects used by this book to provide examples of the use of the various components described in the book, it has been constructed in two versions: a straight-through version and a star diagonal version.

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Amateur Telescope Making in the Internet Age: Finding Parts, Getting Help, and More by Robert L. Clark

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