Flare

 

Scattering of light by a lens system resulting in loss of definition and thin shadow tones (1985).

Non-image-forming light caused by scattering and reflection, that degrades the quality of an image.

Coating is used to reduce it. Important in optical printing and projection.

 

References

Case, D., 1985, Motion Picture Film Processing, Media Manuals, Focal Press, London, Boston