EN: Chromatic aberration
When white light (light containing many colors uniformly mixed so that the eye does not sense any particular color and thus perceives the light as white) such as sunlight is passed through a prism, a rainbow spectrum can be observed. This phenomenon occurs because the prism s index of refraction (and rate of dispersion) varies depending on the wavelength (short wavelengths are more strongly refracted than long wavelengths). While most visible in a prism, this phenomenon also occurs in photographic lenses, and since it occurs at different wavelengths is called chromatic aberration.There are two types of chromatic aberration: axial chromatic aberration, where the focal point position on the optical axis varies according to the wavelength, and chromatic difference of magnification, where the image magnification in peripheral areas varies according to the wavelength. In actual photographs, axial chromatic aberration appears as color blur or flare, and chromatic difference of magnification appears as color fringing (where edges show color along their borders). Chromatic aberration in a photographic lens is corrected by combining different types of optical glass having different refraction and dispersion characteristics. Since the effect of chromatic aberration increases at longer focal lengths, precise chromatic aberration correction is particularly important in super-telephoto lenses for good image sharpness. Although there is a limit to the degree of correction possible with optical glass, significant performance improvements can be achieved using man-made crystal such as fluorite or UD glass. Axial chromatic aberration is also sometimes referred to as longitudinal chromatic aberration (since it occurs longitudinally with respect to the optical axis), and chromatic difference of magnification can be referred to as lateral chromatic aberration (since it occurs laterally with respect to the optical axis). Note: While chromatic aberration is most noticeable when using color film, it affects black-and-white images as well, appearing as a reduction in sharpness.
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Color fringing that occurs when a lens does not focus different wavelengths (colors) of light equally.
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Also known as purple fringing. It is fairly common in 2MP digital cameras and above, especially if they have long telephoto lenses. You can see it when a dark area is surrounded by a highlight. In between the dark and light, you may see a band of purple pixels that shouldn’t be there. There are ways of removing this which I have covered in the Photoshop section.
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A fringing effect around the edges, which is caused by lens not focusing correctly.
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Also known as color fringing, chromatic aberration occurs when the collective color wavelengths of an image fail to focus on a common plane. The results of chromatic aberration are most noticeable around the edges of high-contrast images, especially toward the edges of the frame. Chromatic aberration is most common on less expensive lenses, although even the best optics can occasionally display lower levels of chromatic aberration, under certain conditions.Another form of chromatic aberration is called purple fringing, which comprises the purple streaks or halos that often appear within images produced by digital cameras. Purple fringing originates in the light refracted from the light-gathering micro lenses that cap the sensor s pixels. In backlit scenes, this form of purple fringing is commonly called blooming. For more on this subject, see the explora article, ://www.bhphotovideo.com/explora/photography/tips-and-solutions/optical-anomalies-and-lens-corrections-explained Optical Anomalies and Lens Corrections Explained.
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Chromatic aberration, also called colour fringing or purple fringing, is caused by a lens not focusing different wavelengths of light onto the precise same focal plane and/or by a lens rendering a different magnification each of different wavelengths. These two different types of chromatic aberration can both occur in one and the same image. Chromatic aberration can be seen as colour fringing around the boundaries that separate dark and bright parts of the image. It most frequently occurs around the edges of the image, especially in wide angle shots. Despite begin called colour fringing or purple fringing, chromatic aberration can also affect black and white photography. Although a black and white image obviously has no colours in it, chromatic aberration can blur the image. .
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Common lens problem where different colors/wavelengths of light focus at different locations, appears as color fringes or halos in image.
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A phenomenon in which light rays passing through a lens focus at different points, depending on their wavelength. Axial chromatic aberration is a variation in focal length; lateral chromatic aberration, a variation in magnification. Lateral chromatic aberration: Light wavelengths differ depending upon color. Differences in the length of the wavelengths result in changes in image magnification and become visible at image peripheries. Lateral Chromatic Aberration is the cause of color fringing. Lateral chromatic aberration is reduced to some degree by combining different lens elements with different refractive indexes, but optically speaking, it cannot be completely eliminated. In addition to red and its complimentary color, cyan, and blue and its complimentary color, yellow, some lenses may exhibit complex color fringing that combines these two primary types. It is greatly reduced by low-dispersion ED glass.
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A type of distortion that manifests itself as “fringing” of colors along high-contrast boundaries. Because substances have slightly different refractive indexes for different wavelengths of light, colors end up being focused on different points on the images.
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The eye s ability to compensate, after a few minutes, for variations - sometimes drastic ones - in the color of light sources so that everything appears normal. Tip: Since the film doesn t compensate, you may want to use a Color-Temperature Meter.
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in terms of lens optics it is the failure of the lens to focus all colours (RGB) at the same point. It shows up as colour fringes in areas of the image where dark meet light (think edge of a building against the sky). It is more common in wide angle lenses, and those of inferior optics (kit lenses). It is correctable, to some degree, using Photoshop, Lightroom or software of your choice.
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– Also known as color fringing, this distortion appears when the camera lens fails to focus on all the colors where two points of high contrast meet (such as where the dark roof of a building meets the sky). Chromatic aberration appears as green or purple fringing at the point of contrast.
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A lens aberration producingan overall blurred image; the inability of a lens to bring all wavelengths of light(especially red and blue) into the same plane of focus; usually present in regularlarge-aperture telephoto and super-telephoto lenses; does not improve by stoppingdown the lens; correctable through the use of Iow Dispersion (ED, LD SD) glass. Basically, this aberration is causedby light rays of different wavelengths coming to focus at different distances fromthe lense. Blue will focus at the shortest distance and red at the greatest distance.Since the natural rays of light are a mixture of colors, each aberration will givea different value corresponding to each color thus producing blurred images.
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