Everyone, probably, in childhood wanted to assemble their own telescope from improvised materials, but somehow their hands did not reach ... How to make a telescope yourself? Yes, it’s very simple, because now there are many schemes of amateur telescopes of a wide variety of designs.
First, we need an ordinary sheet of Whatman paper. First of all, you need to paint one of the sides of the sheet in black - it will be internal. Painting is necessary so that it is dark inside the telescope tube, which will become the rolled up paper, otherwise you will see a rather blurry image in the eyepiece and you will hardly find the answer to the question “how to make a telescope”. Yes, by the way, whatman sheet should be about 1 meter long - this is the focal length ideal for a makeshift telescope.
So, the tube of the future telescope is ready. Now you need to find a lens for the lens. For a device with a focal length of one meter, a glass with a diopter of +1 is suitable. What is good is that such lenses are sold at a bargain price in any optics store , so you can even buy glasses in reserve.
Next, in the action plan called "How to make a telescope" comes the next item - fixing the lens. The lens is attached at one end of your telescope with cardboard rings and tape. There is an option with fixing the glass with electrical tape, but it is not always suitable. When you firmly connect the lens to the telescope, you can proceed to the next step.
To completely forget about the turbidity of the image, you also need to make a diaphragm. This is the name of a small cardboard circle with a hole in the middle. It is possible to set the aperture both behind the lens and in front of it - this will not affect the final result.
In any case, experiments are welcome, so it is probably your model of reflector that can become an illustration for the book How to Make a Telescope.
If you are not an experimenter at all, then you can look for tables of correspondence between the sizes of the lenses of the lenses and the diameters of the holes in the diaphragms.
For example, a diaphragm with a 40 mm hole is enough for a 70 mm lens.
Next you need to find a good eyepiece, because it is through this glass that you will look.
In specialized stores, small eyepiece glasses are quite expensive - up to 1.5 thousand rubles apiece. But we are not interested in the question “how to make a telescope expensive”, we, on the contrary, want to save. That is why you can forget about shopping.
For the eyepiece, even a glass from the binoculars with which you played as a child is suitable. It is important that it was glass, not a piece of plastic, because plastic gives the image a haze.
The eyepiece is fixed at the end of the second, small pipe, using the same cardboard rings and tape. You can also use plastic corks and caps from cans from under the chips. Why connect a small pipe to a large one so that a static design does not work out - after all, we may need focusing. That is why it is necessary to make the diameter of a small pipe a little smaller than the diameter of a large one.
Making a tripod is optional - you can even use a stack of books under a tripod, since a home-made telescope does not have to be fixed statically, because it gives a fairly small increase, which means that the picture will not tremble.
So you have learned how to make a reflector telescope at home with a minimum of cost!