In order for me to change what was in focus in my photographs, I changed the f-stop number. To add more of a blur and be less in focus, I lowered the f- stop number. To make the image more in focus, I highered the f- stop number. The best photo would have to be the rulers. I like how to focus is directly centered on that middle ruler, and how it blurs out the front and back of the image. You would want to use shallow depth of field to create more of an edgy look, or if you want the main focus to be on one particular area. A large depth of field would be more if you really want to capture the whole scene, to show what a certain thing/ place looks like.