The general type of refraction adopts the Kepler optical path (generally with achromatic objective lens group), the phenomenon effect is very good, the distortion is small, easy to maintain, easy to use, suitable for a wide range of people, but the aperture will be limited (the aperture size has a great impact on the cost The cost of large and large-caliber telescopes is scary), so most of these types of telescopes are small or medium- and small-caliber telescopes.
The reflection type is based on the Newtonian reflection type optical path, and the concave mirror is used instead of the convex lens objective lens. This type of telescope can achieve a large caliber, even more than 10M. The cost of the same caliber is much lower than that of the refractor, but due to the influence of the polishing process , The imaging will have coma, the effect is much more affected by the temperature than the refracting lens, it is not easy to maintain, and the operation is smooth without the refracting lens, but the round-trip optical path can be used to shorten the lens barrel, which is easy to carry.
The foldback type has the advantages and disadvantages of refraction and reflection, and is more portable, but the price is much higher.
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