Inputs
Enter the scene size and working distance. The calculator suggests focal length, coverage angles, and practical lens choices for active construction environments.
Example scenarios
| Scenario | Sensor | Distance (m) | Subject (m) | Margin (%) | Suggested focal (mm) | Category |
|---|---|---|---|---|---|---|
| Interior corridor overview | APS-C | 6 | 4 | 10 | ~32 | Standard (wide-leaning) |
| Facade from across street | Full Frame | 25 | 18 | 12 | ~42 | Standard |
| Crack detail from safe distance | Micro Four Thirds | 8 | 1.2 | 15 | ~95 | Short telephoto |
These are illustrative estimates. Real-world framing depends on your exact position and how much context you want to capture.
Recent results
No saved results yet. Run a calculation to populate this table.
Formula used
Focal length (mm) is estimated from similar triangles:
f = (sensor_dimension × distance) ÷ subject_dimension
- sensor_dimension uses sensor width for horizontal, height for vertical.
- subject_dimension is your subject size plus margin.
- Field of view is computed using 2 × atan(sensor_dim ÷ (2f)).
- Depth of field uses a hyperfocal approximation with sensor-specific circle of confusion.
This calculator supports planning. Always verify with a quick test frame on-site, and follow local safety procedures for access and positioning.
How to use this calculator
- Choose your sensor format to match your camera body.
- Select the use case to tailor practical recommendations.
- Measure working distance from your safe shooting position.
- Estimate the subject width or height you must capture.
- Add a framing margin to include context and safety space.
- Set an aperture to view an estimated depth of field.
- Press Calculate to see focal length and coverage angles.
- Download your result as CSV or a simple PDF report.