What does exposure mean in photography?

1. exposure refers to the process of forming a picture after the photosensitive element of the camera receives external light, which directly affects the brightness of the picture. According to the acceptance of light, exposure can generally be divided into the following three situations: underexposure, correct exposure and overexposure.

2. In photography, exposure is the combination of aperture and shutter. It can be considered that the aperture (value) is actually how big the small round window is, and the shutter is how long the window is. Assuming that the window is only open for 1/4 4 seconds, it is obvious that if the window is half open for 2 seconds, the film can be exposed correctly, because1/4 * 4 =1/2 * 2 =1,and the light input is the same. Similarly, if the window is fully open, the exposure time only needs 1 second. Therefore, correctly exposed photos can have n different combinations of aperture and shutter speed.

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