Depth of field

A macro photograph of a computer keyboard showing the depth of field variation, with very blurry (X, C, V), blurry (S, D, F, G), sharp (Z, E, R, T), and again blurry (2 to 6) keys.

A macro photograph of a Nokia 101 phone with extremely shallow depth of field of only a few millimeters and a strong bokeh effect.

In optics, particularly as it relates to film and photography, depth of field (DOF), also called focus range or effective focus range, is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions.

单词	Focal depth
释义	Focal depth 英语百科 Depth of field In optics, particularly as it relates to film and photography, depth of field (DOF), also called focus range or effective focus range, is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions.
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Focal depth

Depth of field