In photography, the three elements of exposure are: aperture, shutter, and sensitivity. Usually we change these three parameters in camera settings to affect the exposure effect of a photo.
The aperture is used to control the light passing through the lens into the camera body. For the device of the amount of light entering the surface, we usually use the F value to express the aperture size. The smaller the number after F, the larger the aperture, and the larger the number after F, the smaller the aperture. The aperture priority mode we see on the camera is simply that the camera’s metering system calculates the value of the exposure, and then decides how much shutter speed to use to shoot according to the aperture value we set, and other conditions remain unchanged In this case, the larger the aperture, the brighter the picture, and the smaller the aperture, the darker the picture.
The shutter is an important part of the camera. We express the shutter speed in “seconds”. The shutter priority mode we see on the camera is simply the exposure value calculated by the camera’s metering system, and then how much is used according to the shutter value we set Aperture size to shoot, under other conditions unchanged, the slower the shutter speed, the brighter the picture, the faster the shutter speed, the darker the picture, but you need to pay attention to when using a digital camera to shoot, the longer the exposure time, the noise appears in the picture The greater the chance.
Sensitivity is a concept derived from film photography, in film In photography, it is a measure of the sensitivity of the film to light, which is determined by sensitivity measurement and measurement of several values. In digital photography, we continue to use this concept. In fact, the ISO of a digital camera is adjusted by the photosensitive device. The sensitivity is achieved by combining the photosensitive points. Here we will not discuss more detailed principles for the time being. As long as you know, under other conditions unchanged, the higher the sensitivity, the brighter the picture, the lower the sensitivity, and the picture is The darker, the higher the sensitivity, the more likely to be noise in the picture.
The last thing to note is that these three interact with each other, and all three have numerical limits, so we need to apply them flexibly. In addition to special creative needs, we generally hope that the photos we take can be properly exposed. For example, when we need to shoot with a small aperture, in order to ensure accurate exposure, we need to give priority to slowing down the shutter speed, and finally consider increasing the sensitivity appropriately. If possible, use a tripod to keep the camera stable, so that you can get a clear and accurate picture.
Author:SINA,If you need to reprint,please indicate the source:http://www.todaycamera.com/camera-reviews/what-are-the-three-elements-of-exposure