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 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 very good tool from quite a lot of cheap Internet-available elements, new or used. the web is the recent elements “junkyard,” with stuff from around the globe so that you can decide via, day or evening. during this publication you'll find out what’s ordinarily to be had and the way to entry it. you'll methods to review optical elements and mix them from various net resources. you'll get many rules on the best way to make the components that you just don’t purchase or scrounge and the way to revive outdated lenses and mirrors. and you'll examine a few hassle-free physics of designing ergonomic – cozy – telescopes. Navigating your manner round the chances is straightforward utilizing this invaluable and well timed source. With Robert Clark’s assist you can get the easiest that the web 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

Sample text

The pivots are 1/4 × 20 machine screws with the heads sawed off. The threads end about 5/8 inch from the head, so there is a little unthreaded part suitable as a bearing. The telescope can be locked into position by pulling tight a nut attached to the little aluminum handle visable in Fig. 1. 1 in Chap. 2 illustrates the small copyscope. The Medium Copyscope 35 The Medium Copyscope Optical Parts Objective Lens Diameter = 4 1/2 inches Effective Focal Length = 18 inches Back Focal Length about 17 inches Marked: Charles Beveler Company, East Orange NJ Series III This lens was probably used in a large (auditorium size) projector.

Slide the lens along the stick until you have as small and sharp an image of the Sun as you can get. Keep the lens square to the stick. Be careful not to set things on fire. Repeat the process three times and take the average. You may find it helpful to mask off some of the lens to reduce its effective diameter to reduce the heat and to reduce the brightness of the image so you can see it better. You can also use an image of the Moon. However you got it you have the BFL of the objective lens. The eyepiece belongs positioned with its focus located at the focus of the objective.

However you got it you have the BFL of the objective lens. The eyepiece belongs positioned with its focus located at the focus of the objective. To locate the focus of an eyepiece put it against your eye as if you were using it. Stick your finger into the barrel of the eyepiece and determine where the end of your finger is when you can get a sharp image. Stick your finger in the eyepiece, not your eye. The end of 42 4 Build a Good Copyscope your finger has located the focus. The image of the end of your finger will be much enlarged, so you may also have determined that your fingernails need cleaning.

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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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