# F Stop Calculator

**Introduction:**

Calculating the f-stop is crucial for photographers seeking precise control over exposure settings. The f-stop, also known as the aperture value, determines the size of the aperture opening in a camera lens. This article provides a simple yet accurate HTML and JavaScript code for a f-stop calculator, aiding photographers in optimizing their exposure settings.

**How to Use:**

To use the f-stop calculator, enter the lens focal length and aperture diameter in the provided input fields. Click the “Calculate” button, and the result will display the f-stop value, enabling photographers to set their cameras accurately for optimal exposure.

**Formula:**

The formula for calculating the f-stop (f-number) is given by:

*f*−*stop*=*aperture diameter / focal length*

**Where**:

is the distance from the lens to the image sensor.**focal length**is the size of the aperture opening.**aperture diameter**

**Example Solve:**

Let’s say you have a lens with a focal length of 50mm, and the aperture diameter is 25mm. Plugging these values into the formula:

*f* – *stop*=25/50 = 2

So, the f-stop for this configuration is 2.