The Backyard Astronomer's Guide - 4th Edition Revised & expanded - Terrance Dickinson & Alan Dyer Observing Accessories Working both with and without

Working both with and without a telescope

900+ Object Database

A strong spring and a threaded twist lock provide a two-level strong and secure grip on the optical instrument’s eyepiece so you can image with confidence

At only 6 ounces weight

allowing you to utilize most of today’s best autoguiders

The Backyard Astronomer's Guide - 4th Edition Revised & expanded - Terrance Dickinson & Alan Dyer Observing Accessories Working both with and withoutREVISED AND EXPANDED EDITION This classic, groundbreaking astronomer's guide has been the go to field guide for both beginning and experienced amateur astronomers for nearly 30 years. The fourth edition, revised, brings Terence Dickinson and Alan Dyer's invaluable manual completely up to date. Setting a new standard for astronomy guides, it will serve as the touchstone for the next generation of stargazers as well as longtime devotees. Technology and