![]() ![]() ![]() ![]() Flare-inducing light sources may include the sun, artificial lighting and even a full moon. Flare which appears as polygonal shapes is caused by light which reflects off the inside edges of the lens aperture (diaphragm), shown above.Īlthough flare is technically caused by internal reflections, this often requires very intense light sources in order to become significant (relative to refracted light). Light sources will still reflect a small fraction of their light, and this reflected light becomes visible as flare in regions where it becomes comparable in intensity to the refracted light (created by the actual image). Lens elements often contain some type of anti-reflective coating which aims to minimize flare, however no multi-element lens eliminates it entirely. Note: The aperture above is shown as being behind several lens elements. BACKGROUND: HOW IT HAPPENSĪll but the simplest cameras contain lenses which are actually comprised of several "lens elements." Lens flare is caused by non-image light which does not pass (refract) directly along its intended path, but instead reflects internally on lens elements any number of times (back and forth) before finally reaching the film or digital sensor. Look for flare near very bright objects, although its effects can also be seen far away from the actual source (or even throughout the image).įlare can take many forms, and this may include just one or all of the polygonal shapes, bright streaks, or overall washed out look (veiling flare) shown above. The polygonal shapes vary in size and can actually become so large that they occupy a significant fraction of the image. These take the form of polygonal bright regions (usually 5-8 sides), in addition to bright streaks and an overall reduction in contrast (see below). The above image exhibits tell-tale signs of flare in the upper right caused by a bright sun just outside the image frame. ![]()
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