Why is the picture quality of SLR much better than that of HD camera which is twice as expensive?

Digital camera \ The most important factor affecting the imaging quality of the camera is the photosensitive element (half-width and full-width photosensitive elements are generally CMOS, and most of them are CCD). This photosensitive element is equivalent to the film of a film camera. The larger the area, the greater the amount of information that can be carried, and the better the image quality (of course, this is not absolutely proportional, the amount of information is small, and the image quality cannot be good);

General high-definition cameras focus on battery life, portability, anti-shake, focusing speed and other functions. The size of the photosensitive element is not as large as that of SLR, and the amount of information it carries cannot be compared with SLR, so it cannot be compared with SLR simply in terms of image quality. But other aspects may be better than SLR and more suitable for camera shooting.