Category: Common Terms

Bokeh

Bokeh (derived from Japanese, a noun boke 暈け, meaning “blur” or “haze”) is a photographic term referring to the out-of-focus areas of an image produced by a camera lens using a shallow depth of field.[1] In and of itself, bokeh implies no aesthetic judgment or qualities, either good or bad. Bokeh meaning “blur”, it is […]

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Chromatic Aberration

In optics, chromatic aberration (also called achromatism) is the failure of a lens to focus all colors to the same point. It occurs because lenses have a different refractive index for different wavelengths of light (the dispersion of the lens). The refractive index decreases with increasing wavelength. Chromatic aberration manifests itself as “fringes” of color […]

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Barrel Distortion

Barrel distortion In “barrel distortion”, image magnification decreases with distance from the optical axis. The apparent effect is that of an image which has been mapped around a sphere. Fisheye lenses, which take hemispherical views, utilize this type of distortion as a way to map an infinitely wide object plane into a finite image area. […]

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Zoom-Creep

Zoom Creep is a lens’ tendency to slowly (or rapidly) extend or shorten, depending on the downward or upward tilt of the camera. It absolutely necessitates the use of two hands while using the lens and is problematic. Several people have suggested different methods in dealing with this problem, my favorite being the use of […]

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Vignetting 

In photography and optics, vignetting (pronounced /vɪnˈjɛtˌɪŋ/) is a reduction of an image’s brightness or saturation at the periphery compared to the image centre. The word vignette, from the same root as vine, originally referred to a decorative border in a book. Later, the word came to be used for a photographic portrait which is clear […]

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