Unit 2 Chapter 2.b [Still Photography]

2. Camera Control and Adjustment:

a. Exposure- Aperture, Shutter, ISO

b. Depth of Focus and Depth of Field

c. Measurement of light -Exposure Metering System

d. Composition and Perspective

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2.2 b Depth Of Focus and Depth Of Field:

•        The range of acceptable focus in a scene is called depth of field

•        DOF indicates that area, which represents sharpness in the final picture

•        DOF is the distance between the nearest and furthest point from the camera within which the subject is in focus.

•        DOF can be described as the zone of sharp focus extending in-front of and behind the point of focus

•        DOF area begins with the object closest to the lens that appears in focus, and ends with the most distant object in the scene that is still in focus

•        DOF is zone of sharpness

Factors affecting depth of field

•        Aperture- large apertures give shallow DOF while small apertures give greater

•        Focal Length- the shorter the focal length, the greater DOF while longer focal length show small DOF

•        Distance b/w lens and subject- DOF is reduced at close focusing distance, and increases as the point of focus moves further away from the camera

•        Focal Length▲ , DOF▼

•        F-stop ▲ , DOF ▲

•        Distance b/w lens & subject ▼ , DOF ▼.

What is DOF?

Depth of focus is a lens optics concept that measures the tolerance of placement of the image plane (film/sensor) in relation to the lens. When we move the sensor in a digital camera relative to the lens, the plane in object space that is sharply focused moves as well.