The Backyard Astronomer's Guide - 4th Edition Revised & expanded - Terrance Dickinson & Alan Dyer Observing Accessories They build and test the

They build and test the rack and pinion focuser into the TeleVue NP101is APO - Imaging System Refractor Telescope to hold 12 lbs

75 (photographic mode) -

allowing you to utilize most of today’s best autoguiders

The eye relief of 17

9°+ True Field of View

The Backyard Astronomer's Guide - 4th Edition Revised & expanded - Terrance Dickinson & Alan Dyer Observing Accessories They build and test theREVISED 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