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

By Robert L. Clark

The net Age is altering every thing approximately human invention and using expertise. The swap has been in comparison to that of the creation of printing. Making your personal telescope isn’t what it was once, both, thank you partially to the net. The previous days of grinding and sharpening are long past – except you must do it! now you can gather a good device from quite a lot of reasonable Internet-available parts, new or used. the net is the hot components “junkyard,” with stuff from around the world so you might decide via, day or evening. during this ebook you can find out what’s as a rule on hand and the way to entry it. you are going to the right way to review optical parts and mix them from diversified net assets. you'll get many principles on easy methods to make the elements that you simply don’t purchase or scrounge and the way to revive outdated lenses and mirrors. and you'll study a few trouble-free physics of designing ergonomic – cozy – telescopes. Navigating your method round the chances is straightforward utilizing this worthwhile and well timed source. With Robert Clark’s assist you can get the easiest that the net has to supply. start now!

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The distance at which you get the smallest image is the focal length. You can calculate the magnifying power of the telescope by dividing the objective focal length by the eyepiece focal length. 32 3 Telescope Types and Designs The eyeglass version will have significant chromatic aberration but less spherical aberration and less coma. Those improvements follow from the fact that the eyeglass version is slower. It will have an f ratio of 10–20, depending on if you use a one or two diopter lens. The same experiment (twisting the objective lens) to give it a good, solid dose of astigmatism will work.

All the light is combined, and we get white images when we are looking at a white object. Most objective lenses are designed to have the positive (convex) face mounted outward – that is, pointing at the sky. If you do it the other way the flint intercepts the light first and disperses it somewhat as it goes into the crown. A 4-inch objective with both components at exactly 4 inches will, if mounted backwards, act as if it were about 3 7/8 inches in diameter. Some cases in which an objective lens is slightly under corrected for color can be fixed, or at least ameliorated, by reversing the positions of the two components.

The crown component is positive. It will have at least one face distinctly convex. 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.

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