Defocus aberration
Quality of an image being out of focus / From Wikipedia, the free encyclopedia
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"Defocus" redirects here. For the intentional use of defocusing, see Shallow focus.
"Out of focus" redirects here. For the German rock band, see Out of Focus (band).
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 focus 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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