Sometimes when we use camera, the picture result ghosting and flare. It is caused by reflection that forms by large changes in the refractive index of light over the glass air boundary on the lens surface.
We usually use a thin film coating onto lens to minimize the reflections but it's not always work because the light's angle could be the factor that leads to ghosting and flare.
The Subwavelength Structure Coating (SWC) Technology (canon)
The Subwavelength Structure Coating (SWC) Technology is introduced by Canon to minimize reflections. This anti-reflection technology work by aligning countless wedge-shaped structures more minute than the wavelength of visible light on the surface of a camera lens.
Canon's SWC technology can be applied mainly in wide-angle lenses. In the future, Canon will implement SWC technology for all their lenses, especially lens with large-curvature.
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