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

By Rod Mollise

Amateur astronomy is turning into a growing number of well known, quite often as a result of availability of quite reasonably cheap astronomical telescopes of wonderful caliber - commercially-made Schmidt-Cassegrain and Maksutovs. Rod Mollise's publication includes every thing beginner astronomers want to know approximately those telescopes. that includes (but no longer solely) the ever present Meade and Celestron levels, he describes what those tools will do, how one can use them, and that are the easiest to decide on. This e-book comprises every little thing! There are sections on add-ons, watching thoughts, and tricks and guidance gleaned from his 25 years event with this kind of telescope: cleansing, collimating, keeping the telescope and mounting; utilizing the telescope in numerous stipulations; desktop keep an eye on; imaging (wet, electronic and CCD). this can be the ideal booklet for beginner astronomers who're approximately to take a position in a brand new Schmidt-Cassegrain or Maksutov telescope, or if you happen to have already got one and need to get the easiest out of it.

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Additional info for Choosing and Using a Schmidt-Cassegrain Telescope: A Guide to Commercial SCTs and Maksutovs

Sample text

5 inch telescope, the blob of M13 isn't even that bright anymore, looking more like a nondescript smudge. A small scope can do well on the Moon and planets (though not as well as an 8 inch), of course. Should anyone ever consider a little scope? Of course, there are always exceptions. An urban dweller who has Which CAT? 49 to carry her telescope down several flights of stairs to observe probably would be better off with a small scope. " As was mentioned in the first chapter, focal length is the distance between the telescope's objective (be it lens or mirror) and the focus point, the place where the image is formed.

As the scope tracks, the setting circle remains stationary and continues to indicate the proper RA of an object as it moves across the sky. With the lock disengaged, the setting circle turns with the telescope to indicate the changing right ascension of the SCT. Adjacent to the RA lock is the right ascension slowmotion control. Like the declination slow control, this allows the telescope to be moved at slow speeds by hand. This control works slightly differently from the declination slow motion, however.

3 scope gives the nice wide views appropriate for big deep sky objects like large star clusters while still using normal focal length eyepieces. Deep sky photographers also like short focal ratio telescopes. Not only do they produce wider fields. They require shorter exposures than longer focal length telescopes do. This is really nice, because a photographer must expend a lot of effort keeping the telescope tracking a guide star throughout an exposure. It's easy to see why shorter exposures are possible with lower f-ratio scopes.

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