What does camera EV value mean? What is the function of camera EV value?

EV (Expose Value) value: Exposure value, replace the shutter speed and aperture value into integer values ??as shown in the table below. The integer value corresponding to the shutter speed is called TV, and the integer value corresponding to the aperture is called AV value, and you can easily get the exposure by just adding these two values. This value is called EV value (ie, exposure value). As long as the EV value is the same, no matter how the shutter speed and aperture are combined, the exposure will remain the same.

Exposure is achieved through the combination of different shutter speeds and apertures. The exposures achieved are the same, but the shooting environments they are suitable for and the effects they produce are different. For example, if you use a shutter speed of 1/125 seconds and an aperture of f11 in full sunlight, you will get the same exposure as if you used a shutter speed of 1/250 seconds and an aperture of f8.

Shutter priority is similar to aperture priority. We manually set the shutter speed, and the aperture size is automatically matched by the camera. Generally speaking, if you are shooting handheld, the shutter speed should not be lower than 1/60 second, otherwise it is easy to hold the camera unsteadily and make the picture blurry. Of course, if you have enough force or use a tripod, you don't have to worry about stability. On digital cameras, shutter priority is generally represented by "S".

The main application scope of the shutter is to shoot moving objects and occasions. However, it takes a long time to accumulate experience to shoot properly. For example, when shooting walking or moving quickly, the shutter speed is set to 1/ About 250 seconds is suitable, so that you can get a relatively clear picture without shaking; to shoot faster free falling or flying objects, you need to increase the shutter speed to about 1/400 second; and to shoot extremely fast flying, you need to increase the shutter speed to about 1/400 seconds. More than 1/800 seconds. On the contrary, if you want to take photos that are relatively blurry and have different artistic conception, such as swords, swords, shadows, etc., you will get better results by lowering the shutter speed, such as 1 second, 1/2 second, etc.

During the shooting process of a digital camera, if you press the shutter halfway, a picture similar to the final rendering will be displayed on the LCD screen, and the focus and exposure will start. The exposure at this time is exactly the exposure of the final image. If the picture is obviously brighter or darker, it means that the accuracy of the camera's automatic metering is greatly deviated, and exposure compensation must be forced. However, sometimes, the brightness displayed during shooting is different from the actual shooting result. Digital cameras can browse the picture immediately after shooting. At this time, you can more accurately see the brightness and darkness of the picture taken, and there will be no more discrepancies. If the shooting result is obviously brighter or darker, you need to reshoot and force exposure compensation.

When the shooting environment is dark and the brightness needs to be increased, but the flash cannot work, the exposure can be compensated and the exposure appropriately increased. When performing exposure compensation, if the photo is too dark, increase the EV value. Each increase of 1.0 in the EV value is equivalent to doubling the amount of light taken in. If the photo is too bright, reduce the EV value. Each decrease in the EV value by 1.0 , which is equivalent to doubling the amount of light taken in. The compensation interval can be adjusted in units of 1/2 (0.5) or 1/3 (0.3) according to different cameras.

When the white object being photographed looks gray or not white enough in the photo, you need to increase the exposure. Simply put, "the whiter, the more". This seems to be in line with the basic principles and habits of exposure. It's the opposite. In fact, it's not. This is because the camera's metering often focuses on the subject in the center. The white subject will make the camera mistakenly think that the environment is very bright, so it will be underexposed.