Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book sucks unless you're a senior portrait professional

This book sucks unless your a professional senior portrait photographer that likes cheesy barnyard senior portraits. I'm not kidding! If you're a serious amateur and want to learn the techniques of natural light portraiture follow the recommendations of others and buy "Professional Secrets of Natural Light Portrait Photography" by Douglas Allen Box like I did. You won't regret it.