Pinhole Sizing Calculator

Enter value and select unit. Then click on calculate and result will be displayed.

Enter your values:

Depth of Camera:
(from pinhole to film)
Aperture Diameter:
(Leave value at 0 to use optimum)
Metered Aperture:
Metered Exposure Time:


Image Diameter:
Optimum Pinhole Diameter:
Exposure Factor:
Pinhole Exposure Time:
Hole Size Calculation

Enter the value, select the unit in the check box at the back, click "Calculate", and the result will display the conversion value between each unit.

Example of use
Input data: camera depth: 5 inches; aperture (distance from small hole to mirror image): 5mm; metering hole: 10; exposure time: 1/5, click "calculate" to display the result.

Output results: the imaging diameter is 6.5 inches; the optimal aperture diameter is 0.5mm; the aperture number is 25; the exposure factor is 6; the aperture exposure time is 1.2 seconds.

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