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An image, or image point or region, is '''''in focus''''' if light from object points is converged almost as much as possible in the image, and '''''out of focus''''' if light is not well converged. The border between these is sometimes defined using a circle of confusion criterion.
An image, or image point or region, is '''''in focus''''' if light from object points is converged almost as much as possible in the image, and '''''out of focus''''' if light is not well converged. The border between these is sometimes defined using a circle of confusion criterion.
<center>For lessons on the [[topic]] of '''''Focus''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Focus this link].</center>
==Focal Point==
==Focal Point==
A '''principal focus''' or '''focal point''' is a special focus:
A '''principal focus''' or '''focal point''' is a special focus:
