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 advent of printing. Making your personal telescope isn’t what it was once, both, thank you partially to the web. The previous days of grinding and sharpening are long past – until you must do it! now you can gather a good software from quite a lot of reasonable Internet-available parts, new or used. the web is the recent elements “junkyard,” with stuff from world wide so you might decide via, day or evening. during this e-book you can find out what’s quite often to be had and the way to entry it. you are going to the way to assessment optical parts and mix them from assorted net resources. you'll get many rules on the way to make the components that you simply don’t purchase or scrounge and the way to revive previous lenses and mirrors. and you'll research a few trouble-free physics of designing ergonomic – cozy – telescopes. Navigating your manner round the probabilities is simple utilizing this precious and well timed source. With Robert Clark’s assist you can get the simplest that the net has to supply. start now!
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Extra info for Amateur Telescope Making in the Internet Age: Finding Parts, Getting Help, and More
This is just a way of saying that the focal length should be 5 inches or more. What you get is a rather weak magnifier. The lens that will become the eyepiece should be smaller and stronger. One inch diameter is plenty, but it needs to be held pretty close to its subject. One or two inches is about right. The magnifying power of this telescope will be the result of dividing the objective focal length by the eyepiece focal length. The combination of a 5-inch focal length objective with a 1-inch eyepiece will give you a 5 power telescope.
D = Diameter of the field lens of the eyepiece. l = Distance from the objective to the proposed diagonal.
Since the front of the tube will be at least 1 inch from the back of the lens the cone will be reduced by about 3/100 of an inch. If throwing away the remaining 7/100 of an inch of the lens seems to be a problem you can file away a little of the inside of the tube. The importance of getting the objective lens square on the main tube can’t be overstated. If the lens if set so that one edge is closer to the eyepiece than the opposite edge by 1/10 of an inch the image, back at the eyepiece focal plane, will be displaced by about 1 inch.