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Panel: Properties > Object Data Properties > Depth of Field

Real-world cameras transmit light through a lens that bends and focuses it onto the sensor. Because of this, objects that are a certain distance away are in focus, but objects in front and behind that are blurred.

Example of DOF bokeh effect. (Blender 2.82 Manual より)

The area in focus is called the focal point and can be set using either an exact value, or by using the distance between the camera and a chosen object:

Depth of Field

Focus Object

Choose an object which will determine the focal point. Linking an object will deactivate the distance parameter. Typically this is used to give precise control over the position of the focal point, and also allows it to be animated or constrained to another object.

Distance

Sets the distance to the focal point when no Focus Object is specified. If Limits are enabled, a yellow cross is shown on the camera line of sight at this distance.

＋Hint

Hover the mouse over the Distance property and press E to use a special Depth Picker. Then click on a point in the 3D View to sample the distance from that point to the camera.

Aperture

F-Stop

F-Stop ratio that defines the amount of blurring. Lower values give a strong depth of field effect.

Blades

Total number of polygonal blades used to alter the shape of the blurred objects in the render, and render preview. As with the viewport, the minimum amount of blades to enable the bokeh effect is 3, resulting in a triangular-shaped blur.

Rotation

Rotate the polygonal blades along the facing axis, and will rotate in a clockwise, and counter-clockwise fashion.

Ratio

Change the amount of distortion to simulate the anamorphic bokeh effect. A setting of 1.0 shows no distortion, where a number below 1.0 will cause a horizontal distortion, and a higher number will cause a vertical distortion.