Here we have discussed mostly about telescopes, the most discussed being the refracting telescope, which is the earliest discovered astronomical telescope.
Easy to set up, requires little maintenance, and one of the simplest astronomical instruments, the refracting telescope is very reliable especially when it comes to observing and studying the moon, the planets and the sun. It is actually excellent in terrestrial viewings.
Next to the refractor telescope is the reflecting telescope which like the former is excellent in observing the planets and the moon. Another advantage of the reflecting telescope is that it is much more portable and compact.
Another type of scope is the Catadioptrics, a popular example of which is the Schmidt-Cassegrain. This type of telescope makes use of a combined lenses and mirrors in order to form the image of whatever object it is focused at.
The Schmidt Cassegrain is one of the most modern telescopes in use today. And it is likewise said to be one of the best multi purpose scope. This telescope succeeded in improving on the combined use of mirrors and lenses, emphasizing on their advantages and eliminating the usual disadvantages when using them.
The Cassegrain is usually used for deep space observation and astronomical photography.
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