Aperture Calculator
Calculate the Entrance Pupil Diameter based on Focal Length and F-number, or calculate the Focal Length or F-number.
Calculated Result
Entrance Pupil Diameter: 17.86 mm
$$ \text{Pupil Diameter} = \frac{\text{Focal Length}}{\text{F-number}} $$
Configuration & Information
This tab provides information on standard full-stop aperture values and allows for potential future configuration of default values. Currently, the calculation uses the formula: $\text{D} = \text{f} / \text{N}$.
Standard Full-Stop Aperture Values
| F-number | Calculated Value | Relative Light Area |
|---|---|---|
| f/1.0 | 1.0 | 4x |
| f/1.4 | 1.414 | 2x |
| f/2.0 | 2.0 | 1x |
| f/2.8 | 2.828 | 1/2x |
| f/4.0 | 4.0 | 1/4x |
| f/5.6 | 5.657 | 1/8x |
| f/8.0 | 8.0 | 1/16x |
Focal Length: ${getElement('focalLengthInput').value} mm
F-number: f/${getElement('fNumberManualInput').value || getElement('fNumberInput').value}
Generated by Aperture Calculator.
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