Exposure Time Calculator

Calculate Exposure Time





Formula

To calculate the exposure time:

\[ ET = \frac{LN}{ISO \cdot AP^2} \times 100 \]

Where:

What is Exposure Time?

Exposure time, also known as shutter speed, is a photography term that refers to the length of time a camera's shutter is open when taking a photograph. The amount of light that reaches the camera sensor is directly impacted by the exposure time. Short exposure times (like 1/2000th of a second) freeze action, while long exposure times (like 1 second or longer) capture the blur of motion.

Example Calculation 1

Let's assume the following values:

Use the formula:

\[ ET = \frac{500}{400 \cdot 2.8^2} \times 100 \approx \frac{500}{400 \cdot 7.84} \times 100 \approx 16.00 \text{ seconds} \]

The exposure time is approximately 16.00 seconds.

Example Calculation 2

Let's assume the following values:

Use the formula:

\[ ET = \frac{1000}{800 \cdot 4^2} \times 100 \approx \frac{1000}{800 \cdot 16} \times 100 \approx 7.81 \text{ seconds} \]

The exposure time is approximately 7.81 seconds.