Engineering tool
Field of View Calculator
Relate sensor format, focal length and working distance to the field of view you actually get at the part.
Output
- Estimated FOV — width
- 165 mm
- Estimated FOV — height
- 123.8 mm
- Approximate magnification
- 0.053×
- Suggested focal length for a 100 mm FOV width
- 26.4 mm
Formula
FOV ≈ (sensor_dimension × working_distance) ÷ focal_length ; magnification ≈ sensor_dimension ÷ FOV
Frequently asked questions
- Why does my measured FOV differ from the calculated value?
- The thin-lens approximation ignores lens distortion, the real position of the entrance pupil, mechanical back focus and how the working distance is referenced. Treat the result as a starting point for lens selection, then confirm on the bench.
- Can I use this for telecentric lenses?
- No. Telecentric lenses have a fixed magnification and a specified field of view; use the manufacturer's specification rather than a focal-length calculation.
Related engineering material
Next step
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