Advice 1: How to make a telescope

Fascination with the natural Sciences, including astronomy, have always been popular, but in order for this hobby was a full-fledged, you must have a telescope. Problems to buy this device now, however, it is quite expensive. Meanwhile, don't despair — you can build a telescope yourself, the cost will be minimal.
How to make a telescope

To make a telescope at home we need 2 lenses. The first lens, the second eyepiece. Still need 2 tubes that can be glued to heavy paper or select the appropriate size.




  1. Select the lens for the lens. The longer the focal length of the lens, respectively, is less than its optical zoom, which is used for the lens, the greater will be the magnification of the telescope. However, you will need a longer pipe. For example, if you take the lens +1 diopter — the main pipe should be long a little less than a meter. If you take the lens +0.5 diopter — the pipe should be long a little less than 2 meters. The magnification of the telescope in the second case will be 2 times more. Best for the lens to fit the lens for the manufacture of glasses that can be purchased at any optics. They are of high quality and precision.

  2. Choose a lens for the eyepiece. The shorter the focal length eyepiece, the greater the total magnification of the telescope. However, it should be remembered that a very large magnification of the eyepiece can cause defects in the resulting images. Best would be to use a magnifying glass with a focal length of 2-4 cm as an eyepiece, for example, it is possible to use the magnifying glass used by watchmakers, besides, it will be easier to fix in the tube of the eyepiece.

  3. Assembling the telescope. After purchased required lenses can make a telescope. The lenses need to paste in two tubes, which are tightly inserted into each other, but the tube must be able to move easily in order to be able to focus on the object of observation. Inside the tube should be painted black.

  4. Tripod for a telescope. Since optical zoom is not even a simple telescope will be large, care should be taken to support the telescope, otherwise the image will be very jerky. Best fit for this tripod from the camera, but you can think about other options for mounting.



Thus, it is possible to assemble the telescope in one night. Its optical magnification you can assess if you divide the focal length of the lens and the focal length of the eyepiece lens. For example, if the lens has a focal length of 1 meter, and the eyepiece is 4 cm (0.04 m), the telescope will give a magnification of about 25 times. Such a telescope also called a refractor-type telescope and the image that he will give will be "flipped", however, the self-made telescope may be able to meet the needs of the novice Amateur astronomer.

Advice 2 : How to assemble the telescope

Spyglass - vintage item that allows to observe distant objects. But it is an optical device that was used in the era of Great geographical discoveries, has not lost its popularity to this day. The telescope can be done with your hands, and not just for playing or historical reenactment. This tool for ground-based observation needs to give direct, not inverted image.
How to assemble the telescope
You will need
  • — 2 lenses;
  • — heavy paper (Whatman or other);
  • epoxy or nitrocellulose adhesive;
  • — Matt black paint (e.g. enamel);
  • — wooden blank;
  • — polyethylene;
  • — Scotch;
  • — scissors, ruler, pencils, brushes.
Instruction
1
Pick up lenses. Suitable spectacle glass that you can buy in an optical store. One of them should be from +4 to +6 diopters, the second from -18 to -21. The diameter of the positive lens is 4-5 cm, a negative 1-3 see
2
On a wooden cylindrical block, whose diameter is equal to the diameter of the negative lens, wrap 1 layer polietileno film and secure it with tape. You can take ordinary household package. On top of the film wrap paper tube, carefully promazyvaya each layer with glue. Pipe length shall be 126 mm. the Outer diameter equal to the diameter of the lens (positive). Remove the tube from the blank and allow to dry.
3
When the adhesive dries, the tube will harden - wrap it in one layer of polyethylene film and seal with tape. Exactly the same as in the previous step, wrap the tube with paper glue to wall thickness was 3-4 mm. the length of the outer pipe is also equal to 126 mm. Remove the outer part with the inner and allow to dry.
4
Remove polyethylene. Insert the inner tube in the outer. Less detail needs to go inside more with some friction. If there is no friction, increase the outer diameter of the smaller pipe with one or several layers of thin paper. Disconnect the pipes. Paint the inner surface black Matt paint. Dry these parts.
5
For the manufacture of the eyepiece glue 2 identical paper rings. This can be done on the same wooden disc. Outer diameter of rings equal to the inner diameter of the small pipe. The wall thickness is about 2 mm and a height of about 3 mm. Paint the ring black. Now made of black paper.
6
Assemble the eyepiece in the following sequence. The inner surface of the small pipe with one end grease glue an inch. Insert the first ring, then little lens. Put the second ring. Avoid getting glue on the lens.
7
While the eyepiece dries, make the lens. Make 2 paper rings. Their outer diameter should be equal to the diameter of the big lens. Take a sheet of thin cardboard. Cut out a circle with a diameter equal to the diameter of the lens. Inside the circle make a circular hole with a diameter of 2.5-3 cm. Glue the circle to the end of one of the rings. These rings are also vackraste black paint. Assemble the lens in exactly the same way as you collected the eyepiece. The only difference is that the first pipe is inserted into the ring glued to it with a circle, which should be facing the inside of the pipe. Hole plays the role of the diaphragm. Check the lens and a second ring. Let the design dry.
8
Insert ocular knee in the objective. Select a distant object. Move your tube to the sharp, pinching and spreading tube.
Note
No need to make the device high magnification, otherwise the pipe will be difficult to use with it.
Useful advice
Pipe can be painted with white paint with silver or bronzovoi. Before painting, disassemble the instrument. The ocular part can be left as it is.

It is possible to equip a telescope with a lens hood for cutting off unnecessary side beams.

You can use a high quality long lens from the old camera.
Is the advice useful?
Search