Depth of Field a Simple Guide

In your own words, what are the three key factors in determining depth of field for your shot?  Explain in detail how each of these three factors affects the depth of field.

    Three key factors in determining depth of field for your shot are distance from subject, the focal length, and the iris. The distance that the camera is from the subject affects the depth of field as the further that the point of focus is from the lens, the deeper that the depth of field is, and closer the point of focus, the shallower the depth of field will be. Similarly, a smaller focal length which has a wider shot creates a deeper depth of field and a longer focal length creates a shallower depth of field. The third and more primary factor for adjusting depth of field is the iris; using a higher f-stop creates a deeper depth of field and using a lower f-stop creates a shallower depth of field.