Traditional Culture Encyclopedia - Photography and portraiture - What are the advantages and disadvantages of refractive, reflective and folding telescopes?
What are the advantages and disadvantages of refractive, reflective and folding telescopes?
This kind of telescope can be used as an astronomical telescope and a photographic lens for observation, and some astronomical telescopes can also be connected to a camera for photography (some have designed a switching device, others have to be modified by themselves), and the effect is good. This kind of mirror is cheap because the manufacturing cost of metal reflector is much lower than that of glass lens.
Advantages:
1, low price and simple structure.
2. The lens is light and easy to carry.
3. Because the structure of the main imaging lens is a retroreflective cambered surface, there is no chromatic aberration caused by light passing through the glass, which makes this structure especially suitable for telephoto lenses. Generally, it is necessary to correct chromatic aberration when the lens exceeds 300 mm, but it is difficult to eliminate this chromatic aberration without special glass and aspheric structure, which is also the main reason why apochromatic lens (as some people call it) is expensive.
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