Actually I give this book zero stars. It is one of those books that pads the pocket of the author but is stingy with the information it gives. It is too general and does not really deal with problem solving the technicalities involved with taking slides of your own art. I wanted to know on which side of a slide to place a mask. The book failed to give this important piece of information. I found that I had already bought a more comprehensive book, so I feel that I wasted my money buying this book.