- Depth of field is determined by several factors:
- Subject Distance
While the camera can actually only focus on one tiny point in space, the depth of field determines how much of the image is in "acceptable focus" to the human eye.
In subjects such as landscapes, a large depth of field is often desired so that the entire scene appears to be in focus. With subjects such as portraits, a small depth of field is often used to blur the background and reduce distractions from the main subject of the image.