By Robert L. Clark

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 creation of printing. Making your personal telescope isn’t what it was, both, thank you in part to the web. The outdated days of grinding and sharpening are long past – except you must do it! now you can gather a superb device from a variety of cheap Internet-available parts, new or used. the web is the recent elements “junkyard,” with stuff from worldwide that you should choose via, day or evening. during this booklet you will discover out what’s often on hand and the way to entry it. you are going to how one can overview optical elements and mix them from varied web assets. you'll get many principles on how you can make the elements that you simply don’t purchase or scrounge and the way to revive previous lenses and mirrors. and you'll study a few trouble-free physics of designing ergonomic – cozy – telescopes. Navigating your manner round the percentages is straightforward utilizing this necessary 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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You may have an astigmatic defect in your eye. If you wear glasses look at the prescription. If the boxes labeled “cylinder” have values the prescription is intended to correct for astigmatism. Try using your glasses as a test. That may fix the problem. Even if your eye doctor doesn’t think that your astigmatism is serious enough to warrant correction it may show up under the demanding conditions imposed by a star image. Before you make any decisions on tube length you need to determine the distance behind the objective lens and the eyepiece.

Just remove the eyepiece and replace it with a pinhole. To use this telescope hold the pinhole as close to your eye as you can with comfort. You will note the following: • As you move change the distance between the pinhole eyepiece and the objective lens the magnifying power changes. The closer you get to having the pinhole actually at the focal point of the lens the greater the magnification is provided and the poorer the image becomes. • The smaller the pinhole the better the image quality. It never gets very good.

Telescope Description and Capabilities 49 We have an additional inch or so of adjustment allowed by the fact that the PVC fixture used to contain the objective lens has about an inch of latitude in terms of how far it is pressed onto the main tube. Eyepiece End and Focuser The eyepiece end requires a little thought because we are building two versions. We would like to be able to do some switching around with the focuser to use it on both the straight through and star diagonal versions. We need a way of attaching a focuser to the 3-inch tube, again maintaining a square relationship while being able to take it apart.

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