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A Schmitt-Cassegrain telescope is again another type of reflector. It is usually small and compact, but extremely powerful. They are also usually extremely expensive, and are not the ideal amateur telescope, instead, they are more related to the professional market.
MOUNTS
ALT-AZIMUTH mounts are the most basic mounts. They are simply cradles supported on a tripod, and the user is required to operate the contraption by hand. These are very inaccurate, and simple, so they are also cheap. Only small telescopes have these mounts.
EQUITORIAL mounts are much more efficient. These are electronic, and, as the object in view moves out of vision (due to the Earths rotation), the mount automatically correct the difference. These are used on modestly-sized telescopes, and are fairly expensive.
DOBSONIAN mounts are simply frames on which a telescope can pivot freely. These are portable and adaptable, and are popular. They were invented by John Dobson of the USA. Dobsonian mounts are slightly unstable, however, and so are not suited to powerful instruments. |
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