The beauty of the starry sky has always attracted people, but if used to admire it in the telescope could only professional astronomers , but now anyone can purchase this optical instrument . The shops are available in a wide range of products and to purchase delivered the most use and enjoyment only need to know how to choose a telescope. Should pay attention to the type of the optical system , the mount , the manufacturer.
Selecting optical system
The most common optical systems are:
– Refractor consisting of a lens and a lens ;
– Reflectors consisting of a lens and mirrors ;
– Systems with a combined set of lenses and mirrors : Cassegrain Schmidt – Cassegrain Maksutov – Cassegrain .
Before you decide how to choose a telescope to determine what it is : for astronomical observations or landscape to introduce children to the wonderful world beyond Earth or relax mind , admiring the stars and planets.
For observations on the open areas of the refractor telescopes are convenient , but they are not suitable for those planning to watch the stars from the balcony or from the open window of his apartment.
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The optical system of reflectors has fundamental differences from refractors : lenses as they used a concave mirror. The cost of producing mirrors significantly lower than the production of lenses , and therefore price telescopes having the same diameter of the lens , with an optical reflector system is lower than refractors several times. But thinking about how to choose a telescope , it is important to remember that the reflector mirror with a thin reflective layer require a more careful treatment , they are harmful drastic temperature changes , condensation .
The use of optical systems Cassegrain Maksutov – Cassegrain and Schmidt – Cassegrain telescopes in amateur allows us to observe distant objects without distortion. They are compact and allow you to get enough clear photos of the sky . Those planning often carry a telescope suitable optical system Maksutov – Cassegrain .
The maximum increase
It is the multiplicity of maximizing most interested in choosing a telescope. But this figure is not so important , it can be extended with special eyepiece , but only if the aperture allows (the diameter of the lens ) . Eyepieces are relatively inexpensive and can be purchased after a while, after a detailed study of the telescope’s capabilities .
How to choose a telescope with an optimal increase ? The magnification while maintaining good image quality is calculated by multiplying the size of the aperture in millimeters by 1.4. Multiply the size of the aperture by 2 allows us to calculate the absolute quality limit increase .
mount
To conveniently and safely use the telescope mount is needed – mechanical moving system on which it is installed . System mounts are many, but the most suitable for the amateur telescope are the azimuth , and equatorial system Dobson . They are quite different from each other and their choice depends on the purpose of the acquisition of the telescope and its model.
For refractor telescopes purchased for children or for the primary acquaintance with the stars , the most suitable are simple and easy to use azimuth mount. They are best suited for ground-based telescopes .
For those who have long studied how to choose a telescope accurate astronomical observations , finding distant faint objects or comets , more suitable equatorial mount that allows you to direct it to the celestial objects using a coordinate system. It is more convenient for photographing the sky .
Dobson system is also quite simple and uncomplicated , its cost is much less than the cost of equatorial mounts , but look weak celestial objects uncomfortable. It is suitable for solving the problem how to choose a telescope powerful enough and high quality for a minimal price. Use a telescope without a mount is not recommended: shake hands, any movement would prevent a clear image of the observed objects .
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