Help! ! ! What does the light ratio mean when photography is polished?

This is the concept of light, which is generally the difference between main light and auxiliary light.

The reasons for the light ratio are: first, the picture is beautiful and the level effect. Second, it can help control tolerance.

The tolerance of color negative film is 7 aperture, so after you choose the aperture value, make sure that all the subjects meet the 7 aperture, which produces a proportional relationship.

According to the aperture, if one light source is 1/60s and 5.6, and the other light source is 1/60s and 4, then the distance between the two light sources is 1: 4. That is, one gear is short by two gears.

In the overall lighting, the most important thing is to ensure that the light ratio is uniform when the foreground and background are uneven, and the picture will be relatively soft. As the operation becomes more and more skilled, you will gradually know how to control the light ratio of all the pictures to achieve the desired effect. ?

What is the light ratio of lamp to lamp in portrait photography? The same distance, the same accessories, the same power, adjust the output power, for example,11-1/2 differs by an aperture, which is the light ratio of 2: 1.

Public intermediate key

Main light 1/4 output? Auxiliary light 1/8 output? Profile light? 1/2 output