Small hole size online calculator

App description

Hole size calculation

Enter the value and select the unit of the check box. Click “Calculate” and the result will show the conversion value between each unit.

Usage example

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

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