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Essentially, lenses contain a variety of items that affect image quality. For example, when a lens is directed at a strong light source, a whitish flare is produced. When unneeded light reflects off the lens surface and mirror frame, ghosting occurs. Additionally, the lens' spherical front surface causes some degree of image distortion and contains aberration that cause problems such as color bleeding. In response to these problems, manufacturers of high-quality lenses do their utmost to reduce image degradation by using coatings, aspherical lenses and special types of glass. |
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When a lens is directed at a strong light source like the sun, unneeded rays of light reflected from the lens surface and the camera mirror's frame can have a blanketing effect on the lens. When this happens, all or part of the image turns whitish and sharpness is lost. |
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Commonly regarded as a type of flare, the phenomenon known as ghosting occurs when light repeatedly reflects off the surface of the lens and is seen in the image. Reflections occurring in front of and behind the lens' aperture give the ghost the same shape as the aperture |
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When light refracts inside the lens, image quality is degraded. This is called a lens aberration, or flaw. A wide variety can occur, such as curvilinear, spherical, coma, astigmatic, and chromatic aberration. |
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There are also a number of other types of aberration. Let's have a look at the sample images. Each image's white circles show the kind of deformation caused by that type of distortion. |
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