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All 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.
Although flare is technically caused by internal reflections, this often requires very intense light sources in order to become significant (relative to refracted light). Flare-inducing light sources may include the sun, artificial lighting and even a full moon. Even if the photo itself contains no intense light sources, stray light may still enter the lens if it hits the front element.
Originally posted by BULLETINYOURHEAD
Well I geuss you didn't then, why even ? bother
Originally posted by pianopraze
ETA for those overly upset by the title:
Did I capture a UFO in the park? No... no I did not. I captured lens flare. And this explains why many people who later "find they captured a UFO" didn't see it at the time...
Originally posted by pianopraze
It's a hard thing to come up with an ATS thread title that will draw people.