Depth of Field Calculator

It's not the sensor itself creating more depth of field directly — it's the tighter circle of confusion this calculator assigns to smaller formats (as low as 0.011mm for a 1-inch sensor versus 0.03mm for full frame) combined with typically shorter equivalent focal lengths used on those sensors. A smaller sensor is enlarged more to reach the same output size, so it tolerates less blur before something reads as unsharp, and that stricter tolerance is what the hyperfocal-distance formula translates into a deeper apparent zone of focus.

That happens once your subject distance reaches or exceeds the hyperfocal distance — at that point, the far-focus formula's denominator (H minus (subject distance minus focal length)) goes to zero or negative, meaning everything from the near focus limit out to the horizon is acceptably sharp. This is the classic landscape technique of focusing at the hyperfocal distance to maximize the sharp zone without needing to focus at infinity itself.

Depth of field extends roughly one-third in front of the focus point and two-thirds behind it at typical shooting distances, so tightening the aperture (a smaller f-number denominator in the hyperfocal formula) pushes hyperfocal distance up and stretches the far limit much further than it pulls the near limit closer. This asymmetry is a direct consequence of the near/far focus formulas both being built around the same hyperfocal distance value.

Circle of confusion (c) sits in the denominator of the hyperfocal distance formula, H = f²/(N×c) + f, so a smaller c produces a larger hyperfocal distance, which in turn produces closer near-focus limits and a shallower total depth of field for the same focal length and aperture. This is exactly why the calculator switches c based on your selected sensor size rather than using one fixed value for every camera.