pinhole size calculator

enter a value and select units. then click calculate and the results will be displayed.

enter a value:

camera depth:
(from pinhole to film)
hole diameter:
(leave the value to 0 to use the best value)
mm
measuring aperture:
measure exposure time:
/

calculation result:

image diameter:
 
optimum pinhole diameter:
mm
f-stop:
exposure factor:
pinhole exposure time:
m  secs
pinhole size calculator

enter the value, select the unit in the check box behind, and click "calculate". the result will display the conversion value between each unit.

usage example
input data: camera depth: 5 inches; aperture (distance from small hole to mirror): 5mm; measuring holes: 10; exposure time: 1/5, click "calculate" to display the results.

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