A nice looking 67 page book. If you want to understand your camera meter and histograms, then you must first understand the simple concept of Middle Gray. Middle gray is THE centerpiece of photography in terms of exposure, for color and black and white photography, digital or film. Understand middle gray and you will find using your camera meter, histograms and photography in general a whole lot easier. This simple but thorough guide teaches you everything you need to know about your camera and histograms, so you can concentrate on getting great photographs. Written by John Strazza, master street photographer of over 35 years.