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Hyperfocal Distance and Print Criterion

Estimate hyperfocal distance from focal length, aperture and a print-viewing blur criterion.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

The worked inputs demonstrate the selected model; change a known value or leave an editable unknown empty for a supported inverse.

H=(f+f²/(Nc))/1000 with f,c in millimeters

Worked example

Enter these known values and leave the other values blank.

Sensor size
35mm full-frame
Aperture f-stop
Model f/8
Modify the parameters affecting the circle of confusion limit
Lens focal length (f)
50 mm
Print width
25 cm
Actual viewing distance
25 cm
Standard viewing distance
25 cm
Visual acuity
5 lp/mm
Focal ratio (N)
8
Print height
16.667 cm
Enlargement factor
6.944
Circle of confusion limit
0.0288 mm
Hyperfocal near limit
5.45 m
Hyperfocal distance
10.9 m

Assumptions and limitations

  • Blur tolerance is a selected print-viewing criterion; visual-acuity parameter values are model inputs, not a clinical assessment.
  • Sensor and aperture choices are nominal presets. Use custom values for a measured camera/lens; focus distances are thin-lens approximations.
  • Aperture choices show the actual numeric model f-number, including captured rounded fractional-stop values; choose custom for a measured lens setting.

Common questions

What does this model assume?

Blur tolerance is a selected print-viewing criterion; visual-acuity parameter values are model inputs, not a clinical assessment. Sensor and aperture choices are nominal presets. Use custom values for a measured camera/lens; focus distances are thin-lens approximations.

How do units and inverse calculations work?

Choose compatible units for each quantity. The model converts quantities internally; supported editable fields can be solved from sufficient independent known values. Display rounding does not change the underlying value.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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