This document discusses depth of field and how it relates to portraits. It explains that depth of field is the area in focus in a photo, including the space in front and behind the subject. Aperture size controls depth of field, with smaller apertures resulting in greater depth of field and more of the photo appearing in focus. F-stops are used to describe aperture sizes, with lower numbers indicating larger apertures that produce shallower depth of field. Manipulating depth of field through aperture size is important for portrait photography.

1. Depth of Field & Portraits

7. What is the difference between these photographs? How do we describe the difference?

11. Here is a chart that explains it concisely