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|How to make the telescope the hands of Infoadvisor.net already considered on the example of the telescope refractor. And today we will consider as to create the self-made telescope reflector. |
As you already probably know, in telescopes reflectors the lens is presented by a mirror. To make the self-made telescope reflector quite difficult, especially if manually to do for it mirrors, however undoubted advantage of the self-made telescope reflector in front of the same self-made telescope refractor is its optical increase, bigger in comparison with a refractor.
Fans of astronomy build self-made telescopes reflectors, generally on Newton's system. Isaac Newton approximately in 1670 for the first time created the telescope reflector. It allowed it to get rid of chromatic abberation (they conduct to decrease in image sharpness, to emergence on it color contours or strips which on a real subject are not present) - the main lack of the telescopes refractors existing then.
The scheme of the "Newtonian" reflector looks so:
In this scheme the mirror 1 is the lens which is also called by the main mirror. This mirror is parabolic or spherical. The mirror 2 is called as a diagonal mirror is a mirror directs a bunch of the reflected beams through an eyepiece to the observer. The element designated by figure 3 - okulyarny knot.
Focus of the main mirror and focus of the eyepiece inserted into an okulyarny tube have to coincide. Focus of the main mirror is defined as top of a cone of the beams reflected by a mirror.
The diagonal mirror is made the small sizes, it is flat and can have a rectangular or elliptic shape. The diagonal mirror on an optical axis of the main mirror (lens), at an angle 45 ° to it is established.
The usual household flat mirror is not always suitable for use as a diagonal mirror in the self-made telescope – for the telescope more exact surface is necessary optically. Therefore as a diagonal mirror it is possible to use a flat surface plano-concave or the flat curved optical lens if previously to cover this plane with a layer of silver or aluminum.
The sizes of a flat diagonal mirror for the self-made telescope are defined from graphic creation of a cone of beams which are reflected by the main mirror. At a rectangular or elliptic shape of a mirror of the party or an axis correspond to each other as 1:1,4.
The lens and eyepiece of the self-made telescope reflector are mounted in a telescope pipe vzaimoperpendikulyarno. Fastening of the main mirror of the self-made telescope requires a frame, wooden or metal.
For production of a wooden frame of the main mirror of the self-made telescope reflector you can take a round or octahedral plate not less than 10 mm thick and 15-20 mm more, than diameter of the main mirror. The main mirror is fixed on this plate by 4 pieces of a thick-walled rubber tube which are put on screws. For the best fixing under heads of screws it is possible to enclose plastic washers (the mirror cannot be clamped them).
The pipe of the self-made telescope is made of a piece of a metal pipe, of several cardboard layers which are stuck together among themselves. It is also possible to make a pipe metal and cardboard.
Three layers of a dense cardboard should be stuck together among themselves joiner's or casein glue, then to insert a cardboard pipe into mettalichesky rings of rigidity. Also do a bowl for a frame of the main mirror of the self-made telescope of metal and a pipe cover.
Length of a pipe (tube) of the self-made telescope reflector has to be equal to focal length of the main mirror, and the internal diameter of a pipe – 1,25 diameters of the main mirror. From within the tube of the self-made telescope reflector should be "zachernit", i.e. to paste over with matte black paper or to paint with black opaque paint.
The Okulyarny knot of the self-made telescope reflector in the simplest execution can be based, as they say, "on friction": the mobile internal tube moves along motionless external, providing necessary focusing. The Okulyarny knot can also be carving.
The self-made telescope reflector before use needs to be installed on a special support – mount. You can get as ready factory mount, and to make it independently, of improvised materials. In more detail about types of mounts for self-made telescopes you will be able to read in our following materials.
Infoadvisor.net reminds you what to look at the Sun without use of special sun-protection filters is the extremely hazardous to health of your eyes!
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