The Ccd appears green autofocus, but it doesn't take pictures.

AF stands for autofocus. AF just can't focus. If atrial fibrillation occurs, you need to refocus. Or the light is bad, turn on the flash, or set the camera to automatic mode.

The Chinese name of CCD is charge-coupled device, also known as image sensor, image controller and photosensitive element, which is mainly used in digital photography, astronomy and other fields. CCD is a kind of detection software, which uses the amount of charge to represent the size of the signal and transmits the signal through coupling. CCD has the characteristics of automatic scanning, automatic sensing of the width of Popper range, small size, light weight, low system noise and low functional consumption, and has become the most popular device in photography technology.