Focal Width Length Calculator

How to Use the Calculator

1. Enter the focal length (f) of your optical system in millimeters (mm).
2. Enter the aperture diameter (D) of your optical system in millimeters (mm).
3. Click the "Calculate" button to compute the focal width length (FWL).
4. The result will be displayed in millimeters (mm).

Understanding the Formula

The focal width length (FWL) is calculated using the formula:

FWL = 2 × f × (1 - D/2f)

Where:

• f = Focal Length of the optical system
• D = Aperture Diameter of the optical system

Practical Applications

This calculator is useful for optical engineers, astronomers, and photographers who need to determine the focal width length of lenses or other optical systems. The focal width length is an important parameter in optical design and helps in understanding the behavior of light as it passes through the optical system.

Example

If you have a lens with a focal length of 50 mm and an aperture diameter of 25 mm, the focal width length would be calculated as:

FWL = 2 × 50 mm × (1 - 25 mm / (2 × 50 mm)) = 50 mm