What are film machines, card machines and SLR? What digital cameras do we usually use?

Film machine is an old-fashioned camera that uses film, corresponding to the current digital camera.

Card machine mainly refers to small and light digital cameras, and the larger ones are called portable professional cameras, commonly known as it (usually through LCD screen).

SLR refers to the framing method of digital camera, which is too professional to post. Probably through the principle of single light reflection, through the optical viewfinder (similar to the periscope principle) camera. Because the framing method is more professional and troublesome, and the people who use these cameras are all demanding people, SLR is generally equipped with large photosensitive elements and high-performance image processors, so SLR is generally larger. The long guns and short guns you usually see don't mean that SLR can't work.

A single motor corresponds to a SLR, and the difference is the framing method. Single motor mainly takes photos through electronic viewfinder, which is closer to photographic works in principle and can take better photos in theory. But in fact, many people think that the image quality of single motor is not as good as that of SLR, which is a misunderstanding, because at present, because the internal structure of single motor does not have the optical viewfinder component and unique photosensitive system of SLR, it can be smaller than SLR, and the volume of photosensitive element and processor can also be slightly reduced. You can get a great portability advantage at the expense of a small image quality, so the size and processor of a single motor are not as good as SLR. This is not a "single electricity" problem of a single motor, but a market consideration. If necessary, a single motor can also use the same photosensitive element and processor as the SLR, so that the image quality is not lost at all, but slightly better.

The above cameras are all digital cameras except the film machine. The main difference is that the framing method is different, and because of the different methods, the appearance is mainly different in volume, and other internal structures are the same.