I've seen this book, EF Lens Work III, before (printed version). It's very fantastic for Canon Fan. This is the electronic version of this book (ebook) and you can download it for free. The link is listed below:
Cheers
DSM
I love to share nice digital photographs, photography experiences and some Photoshop CS tips for digital photographers. Let's explore the exciting world via lenses. "If one photo can change a person life, that's good enough"