ClarityHow to use this tool
- Enter focal length, f-number, circle of confusion.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Focal length | Numeric value. Unit: mm. Must be greater than zero. | 50 |
| F-number | Numeric value. Must be greater than zero. | 8 |
| Circle of confusion | Numeric value. Unit: mm. Must be greater than zero. | 0.03 |
Result for these sample inputs
10.4666667 m
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Hyperfocal distance = [focal length²/(f-number × circle of confusion) + focal length]/1000 meters.
Using focal length = 50 mm, f-number = 8, circle of confusion = 0.03 mm, the result is 10.4666667 m. Change these example inputs to match your task; use the method above to check each step.
What to keep in mind
The circle of confusion is a chosen sharpness criterion, not a universal sensor constant. An ideal geometric or exposure estimate. Lens behavior, stabilization, sensor crop and scene conditions may change practical results.
Methodology maintained by ClarityKit. How these tools are built and checked.