There is such a thing in the art of photography as the depth of sharpness, you can often hear from photographers the abbreviation flu, which means literally the depth of the sharply depicted space. Often, people who begin to photograph book definitions are scared and dismissed from incomprehensible instructions and completely unjustified. Do not forget that everything new seems difficult and impossible, but you should carefully read, try and your fear will soon disappear, rewarding you with a lot of beautiful photos.