Crop Factor Calculator

Formula

The formula to calculate the Crop Factor (CF) is:

\[ CF = \frac{D35}{DC} \]

Where:

\( CF \) is the Crop Factor
\( D35 \) is the diagonal dimension of a 35mm film (mm)
\( DC \) is the diagonal dimension of the target camera sensor (mm)

What is Crop Factor?

The crop factor is a measure used to describe the ratio of the dimensions of a camera's imaging sensor compared to a 35mm film frame. It is used to determine the equivalent focal length of a lens when used with different sensor sizes. The crop factor helps photographers understand how a lens will behave on different camera bodies, particularly in terms of field of view.

Example Calculation

Let's assume the following values:

Diagonal Dimension of 35mm Film (D35) = 43.3 mm
Diagonal Dimension of Target Camera Sensor (DC) = 28 mm

Using the formula to calculate the Crop Factor:

\[ CF = \frac{43.3}{28} \approx 1.55 \]

The Crop Factor is approximately 1.55.