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	Call it a rite of passage. Call it the first step on an exciting journey. Call it what you want, but buying a first telescope is a leap of faith. For the beginning astronomer it is a gamble -- a hunch concerning the nature of a hobby not completely known. Does spending more really guarantee a better telescope? For that matter, does "cheap" have to mean poor quality? The telescope market is huge and has many choices, and a road map would certainly come in handy. Philip Harrington's book Star Ware gives the first-time telescope purchaser a means to scope out a buying …&lt;/p&gt;
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	Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools for the contemporary observer. This development of higher quality and more sensitive equipment makes it very necessary to improve the accuracy of the measurements. This guide helps the astronomer and astronomy student to improve the quality of their photometric measurements and to extract a maximum of information from their observations.&lt;br /&gt;
	The book is based on the authors' observing experience, spending numerious nights behind various instruments at many different observatories.&lt;/div&gt;
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                <text>Van glasschijf tot telescoop : praktische handleiding voor het slijpen, paraboliseren en testen van spiegels voor telescopen en voor de bouw van een Newton-type kijker met Dobson-montering&lt;br /&gt;&lt;br /&gt;</text>
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	&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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