Free Pinhole Camera Aperture and Diameter Calculator
Precision optical calculations for DIY film photography. Calculate the optimal pinhole size for your next experimental camera build.
Optimal Diameter
0.31 mm
Aperture (f-stop)
f/159
Why this diameter?
We use Rayleigh's criterion to find the point where diffraction (blurring from the hole being too small) and blur (from the hole being too large) are balanced. This provides the sharpest theoretical image.
Standard Focal Length Reference
| Focal Length (mm) | Ideal Pinhole (mm) | Aperture (f-stop) |
|---|