This title guides reader through basic terminology. It contains chapters on a wide range of lenses in a concise, clear format for beginner to intermediate level photographers. The book comes with a handy pullout quick reference card. Lenses for Digital SLRs: The Expanded Guide covers everything from focal length to depth of field, prime versus zoom lenses, and specialist optics, this book manages to unravel the technicalities of lenses while remaining comprehensible and reader-friendly. Throughout the book, the reader is guided through common focal lengths, what optical quality means in terms of the photographs they take, and eventually comes to understand the anatomy of the camera lens and its effect on the image.