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In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge. [1] Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics.
An n-ellipse is the set of points all having the same sum of distances to n foci (the n = 2 case being the conventional ellipse). The concept of a focus can be generalized to arbitrary algebraic curves. Let C be a curve of class m and let I and J denote the circular points at infinity. Draw the m tangents to C through each of I and J.
Point of view shot (Often abbreviated as 'POV'). A shot which shows an image from the specific point of view of a character in the film. Racking focus A shot employing shallow focus in which the focal distance changes so that the background is gradually brought into focus while the foreground is gradually taken out of focus or visa versa ...
Focal point may refer to: Focus (optics) Focus (geometry) Conjugate points, also called focal points; Focal point (game theory) Unicom Focal Point, a portfolio management software tool; Focal point review, a human resources process for employee evaluation; Focal Point, a 1976 studio album by McCoy Tyner "Focal Point: Mark of the Leaf", a Naruto ...
Some photographers incorrectly restrict use of the term bokeh to the appearance of bright spots in the out-of-focus area caused by circles of confusion. [2] [3] [4] Bokeh has also been defined as "the way the lens renders out-of-focus points of light". [5] Differences in lens aberrations and aperture shape cause very different bokeh effects. [6]
There is a point, however, beyond which everything will be in pictorially good definition, but the longer the focus of the lens used, the further will the point beyond which everything is in sharp focus be removed from the camera. Mathematically speaking, the amount of depth possessed by a lens varies inversely as the square of its focus.
“Focus is a skill that can be cultivated with practice, mindfulness and the right tools," Brian Smith, organizational psychologist and founder of IA Business Advisors, tells Yahoo Life.
Hypocenter (Focus) and epicenter of an earthquake. An earthquake's hypocenter or focus is the position where the strain energy stored in the rock is first released, marking the point where the fault begins to rupture. [3] This occurs directly beneath the epicenter, at a distance known as the hypocentral depth or focal depth. [3]