The novice asked, how to tell which gear the photographer used from the parameters of the photo? Such as a file, s file, p file and m file.

As the name implies, this is a fully automatic gear. In traditional cameras, Auto gives the shutter and aperture according to the built-in exposure meter. It's that simple. All you need to do is press the shutter. In DC, the camera needs to do more work, that is, white balance and ISO. Of course, in the default mode, it is also automatic white balance and ISO.

(2) one (AV)

The first gear refers to the aperture priority mode.

This is also the most popular mode. So what did document A do? Let's talk about the name of aperture first. All you can adjust in this file is aperture. The camera will give the appropriate shutter speed according to the built-in metering system to ensure the correct exposure of the camera. Of course, in DC, you can also manually control the white balance, exposure compensation and metering mode (spot measurement/matrix/medium weight), which Auto can't do. Let's call it a semi-automatic handle. Aperture priority can be controlled well and deeply. If you understand the principle of reciprocal rate, you can easily control the shutter speed with the aperture. The larger the aperture, the faster the shutter, and vice versa. So this file basically allows you to complete all the shooting work. Of course, you should be very careful about shutter overflow (the shutter speed is too fast under large aperture, which exceeds the rated speed of the camera, and the camera will prompt you at this time).

(3) Television

S file is just the opposite of A file, which is the shutter speed priority mode. In this mode, you can adjust not the aperture, but the speed. Of course, you can also adjust the metering mode such as white balance exposure compensation. The camera will give the appropriate aperture according to the speed you choose. This mode is generally used for sports photography or fixed-speed photography. For example, if you want to shoot running water, you should fix the shutter speed at 1/4. It's best to use S file at this time. Please note, however, that the S gear will overflow the aperture (the maximum aperture will be exceeded when telling the shutter, or the minimum aperture will be exceeded when the shutter is at low speed). You can also adjust the aperture by speed according to the law of reciprocity.

(4)P

P file is the program file, and the program is exposed. In fact, to put it bluntly, it is the combination of A file and S file. In this file, you can adjust the white balance, exposure compensation and metering mode. The camera will give a reasonable combination of aperture and shutter according to the built-in metering system. You just need to use the turntable to choose the right one from the middle. In this mode, there is no need to consider overflow. The others are the same as A/S.

(5) Male

M gear is a full manual gear. The built-in metering system in this gear can't control the aperture and shutter, and the aperture speed can be adjusted at will. If you have no experience and no external exposure meter, this kind of equipment is prone to underexposure or overexposure. Only in some extreme cases can M gear be used.

Auto/Av/Tv/P/M file shooting mode is common in the top turntable of digital cameras.

In the Auto/A/S/P file, the exposure value is locked by the built-in exposure meter, and the exposure value cannot be changed by adjusting the aperture, only the depth of field can be changed. Exposure value will only change in the M file, because the M file is not limited by the built-in exposure meter. In A/P/S, you want to change the exposure value by adjusting the exposure compensation. In A file, adjusting exposure compensation is actually adjusting speed, in S file, adjusting aperture, and in P file.