If we place a dandelion in front of the sun, its regular structure creates a corona, just as water droplets in clouds do. It is best seen when photographed somewhat out of focus. The first two images reveal what differences focusing can make.
Koszorúk. A harmadik foton 3 gyűrű is jól kivehető.
Coronae. In the third image, three rings can be distinguished.
Diffraction in a few sharp images