It's one of the most effective ways that you can beautify an image, especially in a narrative or a fine art context. These loose ends of stray light, when you pare the rest away, is what lens flare is in the simplest possible terms. It's a delicate process, one more than capable of being disrupted by something as gauche as a raw beam of light imposing itself straight-up, becoming frayed and disorderly, contaminating the scene as it advances throughout. When a beam of light bypasses this protocol of convergence, you get light spilling and splaying into areas of the frame where there is none in actuality. All of the parts of an image are made up of bent light converging to a single point by way of a lens. There are a few different factors that will all determine how this direct light is conveyed visually in the final photo. Why does light behave in this way after interacting with a specular surface first-hand? Lens flare, by definition, is light that penetrates the lens first-hand, a straight shot from the source if your shot includes flaring of any kind, you already know that you're dealing with light touching the lens directly.
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