By Robert L. Clark
The web Age is altering every little thing approximately human invention and using know-how. 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 web. The outdated days of grinding and sharpening are long past – until you must do it! now you can gather a good tool from a variety of cheap Internet-available parts, new or used. the web is the hot components “junkyard,” with stuff from worldwide that you can decide via, day or evening. during this publication you'll find out what’s commonly on hand and the way to entry it. you are going to tips on how to evaluation optical elements and mix them from varied net resources. you'll get many principles on tips to make the components that you just don’t purchase or scrounge and the way to revive previous lenses and mirrors. and you may examine a few user-friendly physics of designing ergonomic – cozy – telescopes. Navigating your means round the percentages is straightforward utilizing this precious and well timed source. With Robert Clark’s assist you can get the simplest that the net has to provide. start now!
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Additional info for Amateur Telescope Making in the Internet Age: Finding Parts, Getting Help, and More
Don’t just rotate the objective, because the fault is more likely to be in the attachment of the objective to the main tube than in the objective itself. If neither the objective nor the eyepiece seem at fault there may be two more places to look. If you have a star diagonal try checking the diagonal mirror. If it is not square to the optical axis the light from one side will be forced to travel a greater distance than the light from the other side. There is one more part of the system to check.
Typical of PVC fittings the large end of the adapter has a slight taper. That is so that, when used for plumbing, a pipe pressed into the fitting will fit tightly. Because of that taper our ring has to be made into a split ring. Just cut about a 3/8 inch slot in the ring. That allows a little compression so it can be squeezed into position. It can be cemented in place with PVC cement. The supplied cell is slipped into the adapter to rest on your split ring and is held in place by two 1/4 × 20 machine screws taped Telescope Description and Capabilities 47 Fig.
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.