How to set the shutter speed of Canon 500d?

It's very useful to give you some study materials of photography I learned before.

(1)Auto As the name implies, this is a fully automatic gear. In traditional fc, 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 must do one more step, that is white balance. Of course, in the default mode, it is also automatic white balance.

(2)A The so-called A file refers to the aperture priority mode, which is also my favorite mode. 99.99% of my photos were taken with this file. So what did document A do? Let's start with the name aperture priority. In this file, you can only adjust the aperture. The camera will give the appropriate shutter speed according to the built-in exposure meter to ensure the correct exposure. Of course, in DC, you can also manually control the white balance, control the exposure compensation and control the metering mode (point 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 the overflow of the shutter (the shutter speed is too fast when the aperture is large, which exceeds the rated speed of the camera, and the camera will prompt you at this time)