![]() However, every design of lens has its own characteristic quirks and flaws. Typically, these manifest themselves as vignetting, where the corners of an image are slightly darker than the centre as a result of light fall-off, and chromatic aberration or colour fringing along high-contrast edges, where the lens has been unable to focus different colours or wavelengths of light to precisely the same point. In any case, it is fundamentally impossible to make a perfect lens – so, based on its design, every lens will exhibit a greater or lesser degree of optical irregularities. When lenses are designed, optical physics dictates what is possible, along with the price point of the lens and the complexities of manufacturing. One area in which this can prove useful is in correcting for shortcomings and quirks in optical performance. ![]() Digital technology provides the ability to adjust images in-camera or on a computer after capture. ![]()
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