Camera. Purple stripes appear on the screen when taking pictures? What is the reason?

Dispersion ~ commonly known as "purple edge", dispersion is due to the different refractive indexes of light waves of different colors when the light path refracts through the lens, which leads to the decomposition of the combined light into monochromatic light. The appearance of rainbow is a typical example of dispersion.

The chromatic dispersion in photography causes "purple edge" or red edge and blue edge on the edge of the object in the high light ratio environment. Film is insensitive to dispersion, but digital imaging is very sensitive to dispersion. Now lens manufacturers are trying to solve this problem. The most effective means is to use fluorite and ultra-low dispersion glass in lenses.

When shooting, the way to avoid dispersion is not to shoot in the high light ratio environment, and pay special attention to the light reception at the edge of the object with bright background.