Calculate depth of field, hyperfocal distance, and near/far focus limits for any lens.
A depth-of-field result is a range, not a promise that everything in it is equally sharp. This calculator combines focal length, aperture, focus distance, and the applicable acceptable-blur criterion to report near and far focus limits, total depth of field, and hyperfocal distance. Use it to test a planned lens setup before placing the camera. The easy mistake is to read a far limit of infinity as perfect distant detail; it only means distant points remain within the selected acceptable-blur threshold.
Depth-of-field calculations use a circle of confusion: the largest defocused point treated as acceptably small in the finished image. The calculator relates that criterion to focal length, f-number, and focused subject distance. A smaller permitted circle makes the reported near-to-far range narrower; a larger one makes it wider, even when the lens and focus settings do not change.
The near and far limits are the two distances where calculated defocus reaches the selected threshold. Their difference is the total depth of field when both are finite. Hyperfocal distance is the focus distance at which the far limit reaches infinity for the same focal length, aperture, and blur criterion. The actual focus distance need not sit halfway between the two limits.
It happens when the chosen focus distance reaches or exceeds the calculated hyperfocal condition. Under the calculator's acceptable-blur criterion, there is then no finite distance at which the far boundary is crossed. Infinity does not mean uniform sharpness: the focus plane is still best focused, and detail can still be limited by the lens, diffraction, motion, or resolution.
No. It can show whether the background lies beyond the far DOF limit and how the calculated range changes with aperture or focal length. It does not fully describe blur-disc size, highlight shape, transition character, onion rings, or mechanical vignetting. Those depend on subject-background geometry and lens rendering, so lenses with similar DOF figures can produce different-looking blur.
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