On the Adjustment and Testing of Telescopic Objectives (Classic Reprint) - Hardcover

T. Cooke Sons

9780484166775: On the Adjustment and Testing of Telescopic Objectives (Classic Reprint)

Hardcover

ISBN 10: 0484166778 ISBN 13: 9780484166775

Publisher: Forgotten Books, 2018

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Mastering telescope setup and testing for sharper, more reliable views

Discover practical guidance on aligning and adjusting telescope objectives so you get the best possible performance. This edition explains how to square the optical axis, test for common aberrations, and understand how different objective designs behave under real observing conditions.

This book blends historical technique with clear, actionable instructions for amateur and professional users. It covers essential tests, including how to evaluate focus, observe astigmatism and coma, and interpret interference figures. Whether you’re optimizing a refractor or evaluating a large instrument, you’ll find methods that help you diagnose and improve image quality.

Step-by-step explanations of squaring on the objective for accurate centering through the eyepiece.
Plain discussions of aberrations such as astigmatism, spherical aberration, and zonal flaws, and how to identify them visually.
Hands-on testing methods described in accessible terms, with attention to practical setup and interpretation.
Guidance on choosing and adjusting optics to maximize performance at higher magnifications.

Ideal for readers who want a solid, methodical approach to telescope adjustment, testing, and troubleshooting, whether they work with small portable instruments or larger refractors.

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