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High f-numbers, in the f / 16 to f / 32 range, are highly tolerant of defocus, and consequently have large depths of focus. The limiting case in f-number is the pinhole camera, operating at perhaps f / 100 to f / 1000, in which case all objects are in focus almost regardless of their distance from the pinhole aperture.
In 2016, Apple Inc. released the iPhone 7 Plus which can take pictures with "Portrait Mode" (a bokeh like effect). [24] Samsung's Galaxy Note 8 has a similar effect available. Both of these phones use dual cameras to detect edges and create a "depth map" of the image, which the phone uses to blur the out-of-focus portions of the photo.
Decoupling focus from convergence tricks the brain into seeing 3D images in a 2D autostereogram. The eyes normally focus and converge at the same distance in a process known as accommodative convergence. That is, when looking at a faraway object, the brain automatically flattens the lenses and rotates the two eyeballs for wall-eyed viewing.
This explains why the images for the out-of-focus system (e,f) are more blurry than those of the diffraction-limited system (b,c). Note that although the out-of-focus system has very low contrast at spatial frequencies around 250 cycles/mm, the contrast at spatial frequencies near the diffraction limit of 500 cycles/mm is diffraction-limited.
Locks a particular focus setting, preventing refocusing if the scene changes. [4] AoV: Angle of view. Describes the angular extent of a given scene that is imaged by a camera. APEX: Additive system of photographic exposure. A system to aid calculation of correct exposures, developed in the 1960s. Some aspects are included in Exif. [5] APS-C
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