Choosing and Using a Schmidt-Cassegrain Telescope: A Guide by Rod Mollise

By Rod Mollise

Amateur astronomy is turning into a growing number of renowned, as a rule as a result of the availability of fairly reasonably cheap astronomical telescopes of impressive caliber - commercially-made Schmidt-Cassegrain and Maksutovs. Rod Mollise's booklet comprises every thing beginner astronomers want to know approximately those telescopes. that includes (but now not solely) the ever present Meade and Celestron levels, he describes what those tools will do, find out how to use them, and that are the simplest to decide on. This publication contains every thing! There are sections on add-ons, watching innovations, and tricks and tips gleaned from his 25 years event with this sort of telescope: cleansing, collimating, holding the telescope and mounting; utilizing the telescope in numerous stipulations; machine regulate; imaging (wet, electronic and CCD). this is often the correct e-book for beginner astronomers who're approximately to take a position in a brand new Schmidt-Cassegrain or Maksutov telescope, or in case you have already got one and need to get the simplest out of it.

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Sample text

When the photographer moves the back end of the telescope between the fork arms, the camera bumps into the drive base. A further criticism of the fork is its size and weight. An 8 inch telescope in its mounting is reasonably light and manageable. A 10 inch becomes a problem weightwise, and a 12-14 inch demands a permanent installation. The problem is that the fork-mounted telescope's OTA cannot be easily removed from its mount. The smallest component of the disassembled telescope includes the OTA, the fork and the drive base.

Celestron, for example, introduced several new SCTs that would run for as much as 50 hours off a single small 9 volt cell. Even telescopes still requiring a separate battery were 34 Choosing and Using a Schmidt-Cassegrain Telescope able to offer a host of new features with the coming of DC scopes. One of the most important of these features was the inclusion of various drive rates and slewing speeds. The built-in drive correctors (actually electronic control circuits rather than real drive correctors, but that's what amateurs initially called them) could be set for the normal sidereal rate, solar rate, lunar rate and other specialized drive speeds.

When the motor in the drive base is turned on, we find that it almost magically keeps objects in view for as long as we care to look at them (assuming an accurate polar alignment, the pointing of the RA axis at the North Celestial Pole, has been accomplished). Let's take a detailed look at fork-mounting. 30 Choosing and Using a Schmidt-Cassegrain Telescope The fork's side bearings attach the telescope to the mount and allow for movement in declination. These are fairly large, several inches in diameter.

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