Depth of Field Calculator

Formula

To calculate the Depth of Field:

\[ DOF = \frac{2 \cdot u \cdot N \cdot c}{f^2} \]

Where:

\(DOF\) is the depth of field
\(u\) is the distance to the subject
\(N\) is the f-number
\(c\) is the circle of confusion
\(f\) is the focal length

Depth of Field Definition

A depth of field is defined as the distance between the nearest and furthest distances that are in acceptably sharp focus in an image. This is a critical concept in photography and cinematography, as it influences the clarity and focus of the subject and background in a captured image.

Example Calculation 1

Let's assume the following values:

Distance to the Subject (\(u\)) = 10 units
F-Number (\(N\)) = 8
Circle of Confusion (\(c\)) = 0.02 units
Focal Length (\(f\)) = 50 units

Using the formula:

\[ DOF = \frac{2 \cdot 10 \cdot 8 \cdot 0.02}{50^2} = 0.00128 \text{ units} \]

The Depth of Field is 0.00128 units.

Example Calculation 2

Let's assume the following values:

Distance to the Subject (\(u\)) = 20 units
F-Number (\(N\)) = 5.6
Circle of Confusion (\(c\)) = 0.03 units
Focal Length (\(f\)) = 100 units

Using the formula:

\[ DOF = \frac{2 \cdot 20 \cdot 5.6 \cdot 0.03}{100^2} = 0.00067 \text{ units} \]

The Depth of Field is 0.00067 units.