Near Depth-of-Field Limit
The near depth-of-field boundary estimates where defocus reaches a chosen blur-circle tolerance.
Near Depth-of-Field Limit
Optics · 4 inputs
How to use this calculator
- Enter focal length in mm.
- Enter f-number in f/.
- Enter circle of confusion in mm.
- Enter focus distance in m.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Keep capture settings, physical dimensions and delivery requirements in separate columns of the job notes. A mathematically equivalent setting may change motion blur, depth of field or noise. Check an actual frame before committing an entire session to a numerical estimate.
The thin-lens model excludes field curvature and subjective sharpness differences; focus distance must exceed focal length.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
Related calculations
Far Depth-of-Field Limit
The far depth-of-field boundary follows the same geometric blur criterion as the near boundary.
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