Diffraction effects (also known as Glare) occur when light goes through small holes, causing interference patterns in the shape of the lens aperture. Light will always cause slight interference patterns because of the optical components used, causing the visual “artifact” known as glare.
- Aperture Map: The shape of the diaphragm will model the pattern of light that reaches the film. For example, a circular diaphragm will create circular patterns; a hexagonal diaphragm will create 6 light streaks. You can set the diaphragm shape using a black & white or color map called the aperture map.
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