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                <text>Telescope Optics : Complete Manual for Amateur Astronomers</text>
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                <text>&lt;p&gt;
	&lt;span class="goog_qs-tidbit goog_qs-tidbit-0"&gt;Into this breach step Rutten and van Venrooij, two Dutch astronomers who wanted to know more about optics but found that resources were generally&lt;/span&gt; unavailable to amateurs. So, they wrote their own. Telescope Optics is a compendium of optical information, geared to the intermediate to advanced amateur. Like Gaul, it can be divided into three parts: Chapters 1 through 4 discuss optical principles; Chapters 5 through 16 apply those principles to various telescope and accessory designs; and Chapters 17 through 22 cover evaluation and design.&lt;/p&gt;
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	The manner of the text is generally scholarly but informal. Although optical principles are explained from the fundamentals, the authors still assume a certain level of comfort with high school mathematics and analytical exposition. In particular, it helps if the reader can easily digest information in two-dimensional graphs. This can make the book somewhat imposing for those readers who really just want to know, at a high level, what makes their own telescope tick.&lt;/p&gt;
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	For those readers capable of making their way through the analysis, however, the authors clearly and comprehensively explain the workings of several telescope and camera designs, and discuss in brief the quirks of at least half a dozen more. The compromises of each design are detailed to the level of so-called "third-order aberrations"; these include coma, astigmatism, field curvature, spherical aberration, and distortion.&lt;/p&gt;
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	The authors also make available their own design software. Being 15 years down the line, the software is somewhat out of date, and it does not come free with the book; it must be purchased separately. The book does explain how to use the software, though.&lt;/p&gt;
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                <text>Cet Exellent petit ouvrage, traduit de l'allemand, est un guide pour l'amateur, surtout le débutant, qui désire se procurer une lunette ou un télescopeet commencer des observations. L'auteur commende par donner des consiels précieux pour le choix d'un instrument. Il taite ensuite de la monture équatoriale, des accessoirres ( chercheur, oculairs, etc) et du test de l'instrument. Les chapitres suivants se rapportent à l'observation du soleil, de la lune, des planètes, des occulations et des méteores; chaque fois, l'auteur indique quelles sont les observations auxquelles un amateur peut participer activement. On trouvera ensuitedes notions de fotographie astronométrie, ainsi que des consiels pour la contruction d'un cadran solaire. A la fin de ouvrage, dix appendices fournissent d'utiles renseignements divers. L'ouvrage est vivement à conseiller au débutant avanjt qu'il n'achète ou ne construise un téléscope. J.Meeus</text>
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	The author has pioneered the measurement of brightness variations in stars over very short time scales and in this book he discusses the applications of astronomical photometry with time resolutions of between 10 microseconds and 10 minutes to a wide variety of objects.&lt;/div&gt;
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