By Robert L. Clark
The net Age is altering every little thing approximately human invention and using expertise. The switch has been in comparison to that of the advent of printing. Making your personal telescope isn’t what it was once, both, thank you partially to the net. The outdated days of grinding and sharpening are long gone – except you need to do it! now you can gather an outstanding device from a variety of reasonable Internet-available parts, new or used. the web is the hot components “junkyard,” with stuff from around the world that you can choose via, day or evening. during this booklet you will discover out what’s in most cases to be had and the way to entry it. you are going to review optical elements and mix them from varied net 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 may research a few straight forward physics of designing ergonomic – cozy – telescopes. Navigating your method round the percentages is straightforward utilizing this helpful 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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Additional info for Amateur Telescope Making in the Internet Age: Finding Parts, Getting Help, and More
The Dolmeyer designs, for example, are made from four pieces of glass, one pair at the front and a pair at the back (in this case the two pairs are alike). There is a couple of inches of air between the two pair. In one example the back focal length is 12 inches and the effective focal length is 16 inches. We use the BFL to determine where the image is to be found and the EFL to calculate the magnifying power of a telescope resulting from using the objective lens with a particular eyepiece. In other words, the BFL is a construction criteria and the EFL is a performance criteria.
You need a way to attach the lenses to tubes and a way of sliding the smaller tube into the larger one to allow you to focus the telescope. You can either make a couple of doughnuts from thick cardboard and glue them in place or use the rolled up strips technique to make a rather substantial doughnut. You can even use scotch tape. Just don’t get a lot of tape on the surfaces of the lenses and get the lenses fairly square to the tubes. 6 shows a dollar telescope using some mailing tubes and a glued-up tube made from a couple of old file folders, in case you can’t find ready-made tubes that will work.
If a lens or mirror is shifted off the optical axis but still oriented at right angles to the optical axis the effect will be that the instrument is using an off-axis part of the image. If the offending lens or mirror is tilted with regard to the optical axis the effect will be to introduce astigmatism into the image. In most situations a telescope can tolerate shift much better than tilt. There is, of course, no reason why you can’t make two errors and have both problems at the same time. The effect of a centering error (that is what a displacement amounts to) is to cause the telescope to use a peripheral part of the primary image, which is much more prone to coma than the central part of the image.
Amateur Telescope Making in the Internet Age: Finding Parts, Getting Help, and More by Robert L. Clark