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A Practical Astronomer's Deep-sky Companion is an essential read for deep-sky observers, whether they are interested in imaging or just sightseeing. This large-format full-colour book is designed to be taken out into the field during observing to provide all the information necessary for finding and imaging interesting deep-sky objects. There is a vast amount of information packed into each spread - photographs, position, maps, recommended exposure times, and much, much more.