Answer to the basic knowledge of camera: Why do digital SLR cameras still insist on prism structure?

In fact, you still need to know the difference between single electricity and SLR. . . The following are some previous answers, and you should be able to understand something after reading them:

Generally speaking, the biggest difference between SLR and single electricity is "anti" and "electricity" The difference between these two words actually represents their completely different framework systems. The framing of a SLR camera is an optical framing of human eyes. Light enters the camera from the lens, and then reflects vertically upward from the 45-degree mirror of the camera to the pentaprism/pentaprism at the top of the camera, and then the pentaprism/pentaprism reflects the light vertically and horizontally into the eyepiece at the back of the camera. Simply put, we can imagine it as a periscope-like structure. Therefore, what we see from the eyepiece on the back of the SLR is that when we take a view, our eyes see the light path reflected by the mirror, while what we see on the small DC or single electric screen is first imaged by the sensor and then displayed on the screen. One is pure optics and the other is optics+electricity. The former has no delay, and the latter has delay, which determines that the synchronization rate of SLR framing is very high, which is very conducive to snapshot. Furthermore, when we take pictures with a SLR, because the sensor and screen of the SLR don't work constantly, we save a lot of electricity-that's why the SLR can take more than 500 photos at a time when it is fully charged, and there is no pressure. It's amazing that a small DC or a battery can take 300 photos. Essential difference: SLR: it is a single-lens reflection framing, which means that the scene you see from the viewfinder is the first-hand information you see directly through the only lens. Being impartial and not dragging its feet is the most scientific and mature way to look at it. There is no delay in the shutter and the focus is fast. If you add a polarizer and other filters to the lens, then you can immediately grasp the polarization effect, what you see is what you get. Single electricity: generally speaking, the framing method is the same as that of small dc, without reflector. When you move the camera too fast, or the lens is off-center, you can't immediately grasp the first-hand shooting data, including the brightness you see. It is a choice to save volume. Similarities: both single battery and SLR have large-size photosensitive elements, and imaging is much better than small dc. Single battery = small dc body, handling performance+SLR photosensitive element+interchangeable lens. In addition, although a single battery has a large-size photosensitive element, it does not mean that the imaging can reach the level of SLR, because there are gaps between the lenses. Caliber and manufacturing process are much better than single contrast. Similarly, this is why telephoto dc is superior to card dc or even quasi-professional portable imaging. Although the photosensitive elements are similar in size, the lens aperture is large. In short: SLR is suitable for people who want to learn photography. The big brands Canon Nikon Olympus Pentax are all good.