This is one of the best books made on military binoculars yet. It covers the early use of galilean field binoculars, and proceeds to Prismatic binoculars, covering both ordinary hand held, as well as large aperture fix-mounted binoculars. The author is german, and the book concentrates on german 20th century military optics. French, russian, UK and US binoculars are covered too, but not extensively. Pictures all have german AND english texts, and some parts of the book is written in english. Basic reference material is included, like German production codes, and some Zeiss serial numbers. I have had this book for two years now, and being a binocular collector, I can only recommend this as excellent!.