The pixel data of a general SLR camera is similar to that of a mobile phone. Why is it clearer than a mobile phone?

the size of CCD/CMOS is the decisive factor.

comparing an APS-frame sensor with a Quan Huafu sensor, the sensing area of the full-frame sensor is more than twice as large as that of the APS-frame sensor. assuming that both sensors have 2 million pixels, it can be imagined that the pixel area of the full-frame sensor is also larger than that of the APS-frame sensor. the larger the pixel, the larger the photosensitive area, and the more real and accurate the photoelectric signal obtained by this pixel. It can be understood that under the same frame, the fewer pixels, the higher the picture quality.

Take the camera of a mobile phone as an example. The sensor of the mobile phone is only about 4X3mm, which is very tiny, and the captured light is not an order of magnitude of Quan Huafu (36X24mm). The mobile phone has squeezed 1 to 2 million pixels on such a small sensor. The photosensitive area of pixels is very insufficient, and the signals obtained are often inaccurate or missing. The camera can only guess and interpolate, and the images obtained often have false colors, color cast, inaccurate dark parts, few layers, blurred details and so on. Some pixels are all pasted together, which is equivalent to making up the numbers. It is purely a gimmick to do so many pixels. In this respect, regardless of the "demand" of consumers, Apple's mobile phone only uses a few million pixels for several generations to ensure that the pixel area can be close to the camera level (Old Joe was forced to mention more than 1 million pixels after his death. If Old Joe is still there, how can he care about these market pressures). On the other hand, in SLR cameras, basically most pixels can get enough photoelectric signals, and the details on the image can be as fine as pixels, with high image quality and high tolerance. Anyone who has worked as a studio designer can personally feel the difference in image quality between SLR and ordinary cameras, and can also see the shortcomings of mobile phones.