Telescope Eyepieces

Optical Theory and Design

Sean G. Ryan

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Hardback

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English

CRC Press
27 November 2025

Light (optics); Astrophysics; Instruments & instrumentation engineering; Electrical engineering; Space science

Anyone who has looked through binoculars, a telescope or microscope has used an eyepiece. Telescope Eyepieces: Optical Theory and Design explores the wide range of eyepiece designs. It introduces optics theory progressively to build understanding of how lenses control light in an optical system, both generally and in eyepieces specifically, linking optics fundamentals, design evolution and the implications for image quality. This book presents a logical narrative starting with Snell’s law of refraction at a flat surface, progressing to paraxial and real rays at spherical and aspherical surfaces, lenses and thin-lens systems. It demystifies the origin of aberrations by considering wavefront deviations, all brought to life in the context of the familiar eyepiece. Principles are explored both descriptively and mathematically, and carefully interpreted so the reader is not swamped by a sea of equations. This book contains many diagrams of ray tracing results to illustrate optical principles and the consequences of design choices, enabling the reader to visualise their impact on image quality and to cut through the puffery that is sometimes found in the marketing of telescope eyepieces. It bridges the gap between introductory books and expert-level optical design texts, written jointly for an astronomy readership and for physics and optical-design students.

Key Features:

Develops an understanding of optics by focusing on the design variations of a particular multi-lens system – the eyepiece – which readers will have used when looking through binoculars, telescopes and microscopes Combines descriptions and interpretations of theory with many illustrative visualisations of eyepiece designs to help the reader develop an intuitive understanding of optics and aberrations in the familiar context of eyepieces Written by a Professor of Astrophysics with experience as both an amateur and professional observer using telescopes at observatories around the world

By: Sean G. Ryan
Imprint: CRC Press
Country of Publication: United Kingdom
Dimensions: Height: 234mm, Width: 156mm,
Weight: 570g
ISBN: 9781041135876
ISBN 10: 1041135874
Pages: 202
Publication Date: 27 November 2025
Audience: College/higher education , Professional and scholarly , Professional and scholarly , Primary , Undergraduate
Format: Hardback
Publisher's Status: Active

Table of Equations Glossary of Variables and Points 1. Introduction 2. Optics Fundamentals 3. A Single Lens Eyepiece and Aberrations 4. Two-lens Eyepieces 5. Multi-glass Eyepieces 6. Beyond the Spherical Lens Index

Sean G. Ryan is a professional astronomer with almost 50 years of experience as an amateur observer. He was appointed Professor of Astrophysics at the University of Hertfordshire in 2006, where he was Head and Dean of the School of Physics, Astronomy and Mathematics for ten years. He has published over 100 research papers on observational astronomy and has co-authored several textbooks, including Visual Astronomy with a Small Telescope.