![]() Light appears much brighter very near the source due to the inverse-square law, which says light intensity is inversely proportional to the square of the distance from the source. Cases include nighttime and underwater photography, when a bright light source and reflective unfocused particles are near the camera. Cause Circular unfocused visual artifacts caused by raindrops.įurther information: Light scattering by particles and Defocus aberrationīackscatter commonly occurs in low-light scenes when the camera's flash is used. Some appear with trails, suggesting motion. Elements are not shown to scale.Ĭaused by the backscatter of light by unfocused particles, these artifacts are also sometimes called orbs, referring to a common paranormal claim. ![]() ![]() A hypothetical underwater instance with two conditions in which circular photographic artifacts are likely (A) and unlikely (B), depending on whether the aspect of particles facing the lens are directly reflect the flash, as shown. It is especially common with modern compact and ultra-compact digital cameras. In photography, backscatter (also called near-camera reflection ) is an optical phenomenon resulting in typically circular artifacts on an image, due to the camera's flash being reflected from unfocused motes of dust, water droplets, or other particles in the air or water. ![]() Optical phenomenon in photography The backscatter of the camera's flash by motes of dust causes unfocused orb-shaped photographic artifacts. ![]()
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