What is exposure? What are aperture, shutter and sensitivity?

Exposure means that the camera film is exposed to a light environment. For today's digital SLRs, it is the photosensitive element that senses the light. The length of time you experience light is called exposure time.

If the brightness of the exposed photo is suitable for our naked eyes to see, it is an accurate exposure. If it is too bright, it is overexposed, and if it is too dark, it is underexposed.

There are several factors that influence whether exposure is over or under exposed. One is the exposure time. The longer the exposure time, the more sufficient the exposure. What affects the exposure time is the shutter. It can be understood that the longer the door is open, the more light will enter. The longer the door is open, the less light will enter. .

In addition to the exposure time, what affects the exposure is the amount of light entering per unit time, which can be understood as the size of the door opening. If the door opening is large, more light will enter per unit time. What controls this size is the aperture. The larger the aperture. The more light comes in.

The third factor that affects exposure is the sensitivity of your photosensitive element to light, which is the sensitivity.

Aperture, shutter, and sensitivity are the three elements of camera exposure, and they are the most important knowledge points when using a SLR. The tutorial in the link below explains the relationship and use of these three in detail, you can check it out.

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