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This is an English translation of a book written in German by Klaus-Dieter Linsmeier, and distributed free by Swarovski Optik North America (SONA). It is primer on optics and all optical instruments.
I bought this rather neat little book today at my local Swarovski dealer. They charged me 5 but I thought that was a rather good bargain so the 'Con' above is tongue in cheek.
I agree with what has been reported here ... this book helped my understanding of how light works and how a lens is made, Recommended!
One more thing: I must praise this brand\'s service: very kind and extremely fast shipping .. for free!