SLR cameras have no dust-proof function, and they will not get dusty without changing lenses.

It is impossible to prevent dust from entering a SLR camera without changing the lens.

The reason is that the camera itself, lens, camera and lens are not completely sealed, and many moving parts of the camera itself, such as shutter and some adjustment buttons, have gaps; There are also gaps between the zoom ring and focus ring of the lens and the interface between the lens and the camera, and dust will enter through these gaps, so dust can still enter without changing the lens. . I used to have a quasi SLR camera. I haven't changed the lens, and there is still dust in it after a long time.

Of course, changing the lens will definitely increase the chance of dust entering. When the environment is bad (such as sandstorm and rain), it is best not to change the lens, otherwise dust and water vapor will easily enter. Every time you go out to shoot, you'd better plan what you want to shoot, bring the necessary lenses, and change the lenses as little as possible. In order to meet the requirements of shooting, one method is to use a zoom lens, which can cover more focal segments; Another method is to bring an extra camera with a different lens. For more important shooting, I usually take two cameras when I go out, a 24-70 lens and a 70-200 lens, and try not to change lenses outside. Although the back is a little heavy, it switches quickly when shooting, which is generally used by professional photographers.

However, the dust on cameras and lenses is not the end of the world. Generally, small dust can be blown away by air. If there is too much dust, you can find a professional repair shop to remove it.