Re-reflections in lens lenses from a strong light source

The lens consists of a set of lenses (in some lenses - of mirrors), designed for mutual compensation of aberrations and assembled into a single system.

From the contour light (bright light sources behind the subject or next to it), caught in the frame or located outside the frame, parasitic reflections from the internal elements of the lens are formed, called glare (or in slang "hares").

Such glare, formed from re-reflection in the lens systems of cameras, is usually called Lens flare (Reflection from lenses). In complex systems, due to the heterogeneity of materials, as well as small defects, internal reflections and scattering occur. In this way, both a visible haze can be formed throughout the image of the frame, and independent elements.

Such visible artifacts are formed when bright light passes through the lens, where one or more reflections from the lens surfaces occur.

Examples of glare from different lens systems

According to the laws of optics and the construction of the image passing through the lens, if the lens in the camera is convex, then the reflection should be inverted.

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This is clearly visible if you build lines from the prominent places on the glare and its source.