If there is a light source (such as the sun or night light) that is in great contrast with the surrounding environment, what is the light presented by this light source in the photo?

These phenomena are caused by the diffusion and reflection of light inside the lens.

Zoom lenses are more serious than fixed-focus lenses because the former generally has more lenses.

Besides, you may still be talking about "starlight"

It can be divided into 2 lines, 4 lines, 6 lines, 8 lines, 16 lines and other types, which can produce diffraction effect of light and form radiation effect, and is mostly used for artistic photography.

This effect can be achieved by narrowing the aperture of the lens. Under normal circumstances, the night scene has a long exposure time, a small aperture and a low ISO, and beautiful "starlight" can appear. In addition, a starlight filter is used.