Equivalent Aperture Calculator

Calculate Equivalent Aperture



Formula

To calculate the Equivalent Aperture (\(EA\)):

\[ EA = FL \times CF \]

Where:

What is Equivalent Aperture?

Equivalent Aperture is a term used in photography to describe the aperture value of a lens when used on a camera with a different sensor size. It is calculated by multiplying the lens's focal length by the camera's crop factor. This measurement helps photographers understand how a lens will perform on different cameras, particularly in terms of depth of field and light gathering ability.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ EA = 50 \times 1.5 = 75 \text{ mm} \]

The Equivalent Aperture is 75 mm.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ EA = 100 \times 2.0 = 200 \text{ mm} \]

The Equivalent Aperture is 200 mm.