Depth of Field Calculator
Depth of Field
Calculate near/far focus limits and total DOF
Background Blur Estimate
Estimate the amount of background blur (bokeh)
Formula
H = f²/(N×c) + f | DOF = Far - Near | Near = s(H-f)/(H+s-2f) | Far = s(H-f)/(H-s) where f=focal length, N=f-stop, c=CoC, s=subject distance
Frequently Asked Questions
What is depth of field?
Depth of field (DOF) is the range of distance in a photo that appears acceptably sharp. A shallow DOF means only a thin slice is in focus (blurry background), while a deep DOF means most of the scene is sharp.
What affects depth of field?
Three main factors: aperture (wider = shallower DOF), focal length (longer = shallower DOF), and subject distance (closer = shallower DOF). Sensor size also plays a role.
What is circle of confusion?
The circle of confusion (CoC) is the largest blur spot that still appears sharp to the human eye. It depends on sensor size, print size, and viewing distance. Standard CoC for full frame is 0.029mm.
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