Today, engineers and opticians have created such a huge number of optical schemes, types of design and installation of a telescope that an astronomer who has to choose his first instrument for observing the sky is completely at a loss from such an assortment. A person who thoroughly approaches the choice of a telescope needs to understand the essence of the operation of a particular optical scheme, take into account many points related to where and how observations will take place and what operating conditions the optics will be subject to. Only by dealing with this kind of things, you can make a truly conscious and correct choice of a telescope.
Refractors-achromats
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