Gradient mirror, the density of the upper and lower parts of the mirror is different, which is used to maintain the correct exposure of different parts under large light ratio.
Medium gray mirror to reduce exposure.
Starlight mirror and point light source produce starry sky canopy effect.
Ghost mirror can produce ghosts.
Color filter, used to correct color or obtain special color effect.
The skylight deepened the blue of the sky and highlighted the white clouds.
Defogging mirror, to offset the hazy feeling caused by fog.
,,,,, many, many, search online by yourself.