As a casual read through any of the major amateur astronomical magazines will demonstrate, there are filters available for all aspects of optical astronomy This book provides a ready resource on the use of the following filters, among others, for observational astronomy or for imaging Light pollution filtersPlanetary filtersSolar filtersNeutral density filters for Moon observationDeep sky filters, for such objects as galaxies, nebulae and Deep sky objects can be imaged in much greater detail than was possible many years ago Amateur astronomers can take photographs that rival those of professional observatories The ability to do this has been brought about by the revolution in CCD cameras and improved filtersThe book pinpoints which astronomical objects are best observed with which filters Post processing using Photoshop is also discussed, since it is helpful in further improving filtered astro imagesThe last part of the book is an observational guide todeep sky objects that benefit from the use of filters all personally observed by the author with notes on the filters used or potentially of use in their observation and imaging There are also notes on their celestial coordinates, magnitudes and other pertinent information Excellent book for getting the basics of filter application and usage. This book, along with Choosing and Using Astronomical Eyepieces, should be an essential part of any amateur astronomer s reference library It will help cut through the noise from marketers and the advice from colleagues, putting in your own hands the tools you need to make informed decisions about whether or not you need this or that astronomical filter If you are an amateur astronomer and don t have this book, get it You ll be glad you did. Good Pretty disappointed with the content about filters I didn t know much about them before the book and I still don t after finishing the book Virtually no detail on actually applying them to an imaging session.