By James Mullaney

ISBN-10: 1846284392

ISBN-13: 9781846284397

This can be a great ebook for me. i'm studying approximately astronomy/stargazing, and in addition trying to find recommendation with regards to deciding to buy my first telescope. The publication is enormously assisting me to higher decide upon my first telescope. The publication additionally contains information regarding components for telescopes and binoculars, it additionally includes rather a lot of knowledge on astronomy. i'm joyful that i bought this publication.

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Read or Download A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series) PDF

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Extra info for A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series)

Example text

Since the optical enhancement is achieved using a full-aperture corrector plate, technically these systems can be considered catadioptrics. CHAPTER SIX Catadioptric Telescopes Maksutov–Cassegrain While the inventions of the refractor and reflector occurred within a scant 60 years of each other, no new form of astronomical telescope appeared on the scene for nearly another three centuries. The idea then dawned on telescope designers of combining the attributes of both the refractor and the reflector into a single system, which became known as the catadioptric (or compound) telescope.

In the common German equatorial mounting, this is done by adding heavy counterweights, while in the fork-style equatorial the telescope is positioned within the fork arms so as to balance itself. The latter form is the one that’s most often used on the compact catadioptric telescopes that are so popular today. In the past, compensating for the Earth’s rotation couldn’t be done using an altazimuth mount, which must be moved in two directions at the same time to achieve this result. However, with the advent of microprocessors, it has become possible to do this very effectively.

There are a number of empirical and theoretical criteria used to express the resolving power of a telescope, the best known being Dawes’ Limit. 56 by the aperture of the telescope in inches. 76″. This means that the latter telescope can reveal detail twice as fi ne as can the former one. Note that, unlike light-gathering power, resolving power is a linear relation: doubling the size of the telescope doubles the resolution. Thus, in theory, the larger the telescope, the more detail that will be seen in the image it produces.

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A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series) by James Mullaney


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