This book is under $20.00 and it isn't like those books that show you TONS of pictures and have no information. I like photography, but need those technical things explained to me. This book is a WONDEFUL reference and has a million diagrams and charts and tons of explainations. If you need to know how to take different pictures than the ones you are taking currently, this book will show you how. It will teach you all about shutter speeds and how to use your lenses.