Sensor / Camera Back
Lens
Focal length
50mm
mm
Subject
Distance
3.0m
m
Circle of Confusion
Circle of confusion sets the blur threshold counted as "in focus". Smaller CoC means a stricter standard and shallower depth of field. It scales with sensor size.
Total Depth of Field
-m
in-focus zone front to back
In front
-
Behind
-
In-Focus Zone
Sharp
Camera
Far
Focus Limits
Near Limit
-
nearest sharp
Far Limit
-
furthest sharp
Hyperfocal
-
focus for max DoF
Total DoF
-
sharp depth
Optics Detail
Circle of confusion-
Hyperfocal distance (H)-
Near focus limit-
Far focus limit-
DoF in front of subject-
DoF behind subject-
Near
-
Far
-
DoF
-
Setup
Sensor diag-
Focal length-
Aperture-
Subject dist-
CoC-
Magnification-
Formula
H = f² / (N · c) + f
Near = s(H-f) / (H+s-2f)
Far = s(H-f) / (H-s)
f focal, N f-stop, c CoC, s subject distance. Far is infinite once subject reaches the hyperfocal distance.
Pro Tips
DoF is roughly one-third front, two-thirds back at normal distances, not 50/50.
Focus at hyperfocal to get everything from half that distance to infinity sharp.
Aperture and distance dominate. Halving the f-stop or doubling distance changes DoF far more than focal length alone.