The larger the aperture of the lens, the better. Some scenes still need a small aperture, such as scenery (F8- 1 1). However, the production cost of large aperture lens is generally slightly higher, so the large aperture lens is generally slightly more expensive. Of course, a lens with a large aperture can also cope with a shooting environment with a small aperture. Look at your demand for aperture. But it really depends on the camera. First of all, see if the focal length meets your requirements. Second, look at the MTS curve. The higher the pixel, the better. The higher the pixel, the clearer it is. First look at the CMOS size. The larger the photosensitive element, the better the image quality can be guaranteed. On the basis of the same size of photosensitive elements, look at the pixel height. If you don't shoot RAW format, you need to rely on the built-in processor of the machine to deal with noise and other problems, and also refer to the noise control ability of the processor.