Lens Horizontal Field Width at Distance Calculator
Lens Horizontal Field Width at Distance is intended for the specific photography task described by its name. Enter sensor width mm, lens focal length mm, subject distance m to calculate a result expressed in m. The formula works entirely in your browser and needs no account or external API. Small-angle pinhole approximation; focus distance matters. This estimate is useful for comparing scenarios when the supplied measurements follow the stated assumptions.
How to use this calculator
- Measure sensor width mm in the units indicated on the input label.
- Enter Lens focal length mm, Subject distance m.
- Read the m result, then compare alternative inputs to evaluate your own situation.
Lens Horizontal Field Width at Distance formula
sensor*distance/focal (m).
- The expression sensor*distance/focal combines Sensor width mm, Lens focal length mm, Subject distance m. Follow the units on each input: the answer is expressed in m.
- Small-angle pinhole approximation; focus distance matters.
Worked examples
Worked example: Lens Horizontal Field Width at Distance
Use these sample measurements: Sensor width mm = 36, Lens focal length mm = 50, Subject distance m = 5.
Compute sensor*distance/focal.
Using the example inputs, the result is 3.6 m. Use this value to verify the formula before changing the measurements.
Understanding the result
Interpret the output as m; it is not a measurement taken directly from a physical system.
Small-angle pinhole approximation; focus distance matters.
Important notes
Small-angle pinhole approximation; focus distance matters.
Review the input units, any required legal or engineering rules, and unusual edge cases before acting on this estimate.
Frequently asked questions
What does Lens Horizontal Field Width at Distance calculate?
It evaluates sensor*distance/focal to produce m from the measurements you enter. For the example values shown, the result is 3.6 m.
Which assumptions matter most?
Small-angle pinhole approximation; focus distance matters.
Can I compare two scenarios?
Yes. Enter another set of measurements in the same units and compare the two outputs.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.