Traditional Culture Encyclopedia - Photography major - What's the matter that SLR cameras can't focus automatically?

What's the matter that SLR cameras can't focus automatically?

The focal length of 1. exceeds the nearest focal length of the lens.

2. The camera is set to MF manual focusing mode.

3. The lens is set to MF manual focusing mode.

4. Improper focus selection of telephoto lens leads to bellows pulling.

5. There is no obvious light-dark boundary near the focus, which makes it impossible to focus.

6. The light is too weak to focus.

Focusing refers to adjusting the focal length when using a camera, which is called Focus in English. Generally, digital cameras have various focusing modes, namely, auto-focusing, manual focusing and multiple focusing modes.

Focusing is also called aiming light, focusing. The process of changing the distance and the position of the distance through the camera focusing mechanism to make the image of the object clear is focusing.