Analysing Lighting Ratios
Lighting Ratios in cineamtography is reffered to the measurements of the amount of light illuminating one area of object in the frame compared to the amount of light on an object or area. its all about how much light is falling in one area vs. another area, soft/hard.
Key to Fill
The term 'Key' is referred to the amount of light coming from the key light in the scene. It is the main illumination of the object or character. The key light, is commonly used for setting your exposure on the lens in other words setting you shooting stop.
Fill light can be bounced and the light can level from a general ambient. it can also be a negative fill. fill is used to describe the opposite side of the key.
Example of MCU (Medium Close Up) Jude Law in an office and quickly we can see the Key light coming from the camera left and its providing the light on the left side of Jude's face. The fill Light is on camera right.

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