To determine the field of view (FOV), divide the field number (FN) of the optical system by the magnification (M).
The Field of View (FOV) Calculator is a crucial tool for photographers, astronomers, and surveillance professionals to calculate the visible area of a scene through a lens or screen. FOV varies based on the focal length, lens type, or magnification level and plays a vital role in selecting appropriate equipment for specific tasks.
Formula
FOV = FN / M
| Variable | Description |
|---|---|
| FOV | Visible area through the lens or screen |
| FN | Diameter of the field number or entrance pupil |
| M | Magnification level |
Solved Calculations
Example 1: Calculating FOV for a Microscope
| Step | Value |
|---|---|
| Field Number (FN) | 20 mm |
| Magnification (M) | 10x |
| FOV = FN / M | 20 / 10 = 2 mm |
Example 2: Calculating FOV for a CCTV Camera
| Step | Value |
|---|---|
| Field Number (FN) | 50 mm |
| Magnification (M) | 5x |
| FOV = FN / M | 50 / 5 = 10 mm |
What is Field of View Calculator | Find the Viewing Distance, Calculate the Angle of View, Focal Length with FOV Calculator – 2025:
A Field of View (FOV) Calculator is a practical tool that is designed to measure and estimate the visible area captured by a camera, telescope, or screen.
This tool is invaluable for photographers, gamers, astronomers, and CCTV planners, helping them determine the optimal focal length, lens type, and equipment positioning for desired coverage.
The FOV Calculator simplifies calculating the horizontal, vertical, or diagonal field of view based on inputs like lens focal length, sensor size, or distance to the subject.
For instance, it is widely used with microscopes to calculate the visible field under different magnifications or with telescopes to determine true and apparent fields of view.
Gamers and sim racers also benefit from tools like FOV calculators for iRacing or Assetto Corsa to improve immersion and screen alignment.
This tool is versatile, accommodating a range of use cases from calculating security camera coverage distances to telescope back focus settings. It’s particularly valuable for professional setups, where precision is key.
Final Words:
In short, the Field of View Calculator is an indispensable resource for achieving precise visual coverage in various domains. Its adaptability ensures optimized performance for cameras, telescopes, and gaming setups alike.
