1. What is Focal Length?

Focal length is the distance between the optical center of a lens and the camera sensor when the subject is in focus. It determines the angle of view and magnification of the lens.

2. How Does the Calculator Work?

The calculator uses the focal length formula:

Where:

• \( Sensor\ Size \) — Size of camera sensor (mm)
• \( Field\ of\ View \) — Angular extent of the scene captured (degrees)

Explanation: The formula calculates the required lens focal length to achieve a specific field of view with a given sensor size.

3. Importance of Focal Length Calculation

Details: Calculating focal length helps photographers and cinematographers choose the right lens for their desired field of view and composition.

4. Using the Calculator

Tips: Enter sensor size in millimeters and field of view in degrees. Both values must be positive numbers (FOV between 0-180 degrees).

5. Frequently Asked Questions (FAQ)

Q1: What's the relationship between focal length and field of view?
A: Shorter focal lengths provide wider fields of view, while longer focal lengths provide narrower fields of view.

Q2: How does sensor size affect focal length?
A: Larger sensors require longer focal lengths to achieve the same field of view as smaller sensors.

Q3: What are typical sensor sizes?
A: Common sizes include full-frame (36mm), APS-C (~23.6mm), and Micro Four Thirds (17.3mm).

Q4: Can I use this for zoom lenses?
A: Yes, the calculation works for any lens, but zoom lenses have variable focal lengths.

Q5: Does this account for lens distortion?
A: No, this is a geometric calculation that assumes perfect rectilinear projection.