Cause of Lens Flare
Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background The light source itself may be in the lens' angle of view, but it doesn't have to be to to cause a lens flare. It is only necessary that stray light from the bright light source enter the lens.
Read more about this topic: Lens Hood
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