Video encyclopedia

Defocus aberration


Lens and Defocus


Depth and Defocus


Depth and Defocus Challenges


NEX How to add background defocus


PHYX Defocus Effect for Final Cut Pro, Motion and AE

In optics, defocus is the aberration in which an image is simply out of focus. This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars. Optically, defocus refers to a translation of the focal point along the optical axis away from the detection surface. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible. Nearly all image-forming optical devices incorporate some form of focus adjustment to minimize defocus and maximize image quality.
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