Photography as both a profession and a hobby is an incredibly expansive topic that covers a remarkably vast range of subjects from science and art. No matter where you lie on the professional spectrum, there is simply always more to learn. These photography tutorials cover the basics as well as more advanced photography techniques to help you gain a better understanding of the art.
The depth of field is the range of distance from the focal plane, which is acceptably sharp. Factors affecting the depth of field are the camera and lens type, aperture and focus distance.