Classifier Instance:

Anchor text: objective
Target Entity: Objective_\u0028optics\u0029
Preceding Context: The types of telescopes that amateurs build vary widely. They range from the very simple to complicated designs including Refractors, Schmidt Cassegrains and Maksutovs. The most popular telescope design is the Newtonian reflector, described by Russell W. Porter as “The Poor Man's Telescope”. The Newtonian has the advantage of being a simple design that allows for maximum size for the minimum expense. And since the design employs a single front surface mirror as its
Succeeding Context: it means (for the person creating the optical elements) that there is only one surface that has to be ground and polished, as opposed to three for the Maksutov and four for the refractor and the Schmidt-Cassegrain. A properly designed and built Newtonian is a high performance instrument, fully capable of matching the performance of other designs, a case where inexpensive does not mean inferior. Typically a Newtonian telescope of 6” or 8" (15 or 20 cm) is considered a good starter project. Some widely available plans found on the Internet include instructions for building 6", 8", and 10" Newtonians.
Paragraph Title: "The Poor Man's Telescope"
Source Page: Amateur telescope making

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