5 stars, normal for a book on astronomy. Concise and comprehensive book that will enable beginners and less beginners to discover the techniques and equipment for the observation of the sky. Well illustrated and didactic this book is, in my view, the reference to who wants his knowledge and / or acquire a telescope or a telescope. Guillaume Blanchard, well known in the area of optics, is a professional who knows how to share his love for astronomy. This feels in this book that hopefully will be followed by many others. Sign: a physicist fascinated by the stars.
