https://bib.cozmix.cloud/files/original/e4c6c1b55def289e51507a262d65db90.jpg 5a29847b70080d82acf7555fe29f38ca Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Instrumenten Boek Een boek. ISBN International Standard Book Number 943396441 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context INS0250 Creator An entity primarily responsible for making the resource Harold Richard Suiter Title A name given to the resource Star Testing Astronomical Telescopes: A Manual for Optical Evaluation and Adjustment Publisher An entity responsible for making the resource available Willmann-Bell Date A point or period of time associated with an event in the lifecycle of the resource December, 1994 Description An account of the resource Many observers harbor misgivings about their telescope. The manufacturer may have guaranteed accuracy to one-quarter wavelength or as diffraction-limited but most telescope users have, at best, only a hazy idea of how to personally verifying such claims. Sure, there are ways to check the accuracy of individual components but for many they are hard to understand or require costly reference optics and other test equipment. Besides, telescope users are interested in the performance of the entire optical train, not just the main optical element. What is really needed is a test that can be used at the observing site, so that all the problems that impact on a telescope's performance can be diagnosed. Isn't there a simpler and more complete way than the complicated shop tests? Yes, the star test is such a method. It uses the entire working telescope. It isnot a poor substitute or a work-around that uses bits and pieces of the optical system. It is the oldest and most sensitive of the optical tests an inspection of the diffraction image itself. Star-test results apply to the complete imaging performance of the telescope. The star test is lightning-fast and requires only a good high-power eyepiece. It tests the telescope for precisely what it was meant to do. Bad or poorly-aligned instruments fail the star test unambiguously. The star test often allows you to correct the optical difficulty immediately in the field, when you might be frantic t Language A language of the resource nothing Format The file format, physical medium, or dimensions of the resource Hardcover