Let's take a look at the solar eclipse taken today. Why is there a crescent next to the sun?

Because the lens is composed of multiple lenses, it is not uncommon for another image to appear under the reflection between the lenses. There is a moon in the photo of the solar eclipse, which captures the sun during the partial solar eclipse and is formed by the refraction of light.

In fact, it's just a halo, because there will be a crescent-shaped area with strong light when the eclipse is not completely blocked by the moon, and a halo will appear next to you when you take pictures directly with the camera.

Extended data:

The virtual images reflected by the camera lens are all eclipses, which should be like a crescent moon. The sun is too bright for you to go around. Sunlight passes through the lens to form an intermediate image, but part of the sunlight is partially reflected at the bottom of the lens, and the reflected light extends outward in the opposite direction to form another crescent-like image, which is actually the image of the sun rather than anything else.