SLR camera. . . When did SLR technology begin? I looked up a lot on the internet. . . But there is no mention of the year when SLR technology started. . . . So I thought,

1837, the world's first camera came out. It's actually a SLR camera. The principle is the same, all cameras take pictures with a single lens. In a sense, the first camera is even more advanced than all SLR cameras now, because it omits the light loss that any SLR camera will cause now: a single lens takes pictures directly without even a reflection in the middle, so that the light can reach the negative without loss. This is the description of the first camera (SLR): after eight years of exploration, L Daguerre finally succeeded in shooting a still life movie in natural light. 1839, 19 In August, the first page of the world photography history was opened-the French Academy of Sciences and the Academy of Fine Arts held a grand meeting, at which this great invention-black box lithography (photosensitive plate) was announced as a positive film shooting.

Why does the structure of SLR still exist?

Single lens reflection. The camera using this technology has only one lens, which is responsible for photography and framing. This can basically solve the problem of poor photo quality caused by parallax. Moreover, when a SLR camera is used to view a scene, the light emitted by the object is focused by the lens, reflected by the inclined reflector to the focusing screen for imaging, and then reflected by the "roof prism" raised at the top. Photographers can observe the scene through the viewfinder eyepiece, and it is the same image as the scene, which is convenient for framing and focusing. When shooting, the mirror will bounce up immediately, the lens aperture will automatically shrink to a predetermined value, and the shutter will open to make the film sensitive; After exposure, the shutter is closed and the aperture of the mirror and lens is reset at the same time. This is the SLR technology in cameras. Now digital cameras have become professional digital SLR cameras after adopting this technology.

Principle of SLR camera: When framing, the shutter is closed and no light reaches the film. Press the shutter button, the reflector quickly turns up to get out of the way, at the same time, the shutter opens, the light reaches the film, and the shooting is completed. Then, the mirrors in most cameras will be reset immediately. But it also brings many disadvantages:

This necessary tilting of the mirror also brings some other problems:

First, the viewfinder will be blocked at the moment of taking pictures. Because the shielding time is only a moment, this is not a big problem for the image that is reset immediately. However, it also raises some emergency issues. For example, when using stroboscopic shooting, you will not be able to see whether the stroboscopic device flashes normally through the viewfinder.

Second, the noise of the mirror moving. This may become an important problem where silence is needed. This noise occurs because there is no moving mirror that suddenly blocks the light path in the ranging camera.

Third, the vibration of the camera, that is, the overall movement of the camera caused by the tilting action of the mirror. Suppose you shoot at a shutter speed of 1/500 seconds, don't worry. This vibration will not be detected. However, if you take accurate photos at a low shutter speed, such as with a telephoto lens in low light, this vibration may cause great problems in imaging. In addition, there is another problem with SLR framing. For example, if we want to shoot with a small aperture like f/32, the light allowed into the lens by f/32 is very weak, which will cause the image seen in the viewfinder to be blurred, and it may be difficult to focus or even impossible to focus at all. In fact, the solution of SLR is quite clever. It will first use the maximum aperture of the lens to complete the framing and focusing. When the shutter is pressed, the aperture of the lens will immediately shrink to the preset aperture to complete the film exposure. At the moment when the exposure is completed, the aperture will be opened to the maximum aperture to prepare for the next shooting.

Therefore, we can know that SLR is actually the oldest and "backward" technology. Why do you still keep its application?

First of all, what leads to the "professionalism" of SLR is the concept that "the directly seen image is obviously more conducive to shooting than the processed image".

Secondly, because there are many mechanical parts of the lens device, the price is also more expensive, which is "noble".

In addition, for a long time, enthusiasts have been helping profiteers drive up prices, and they have obtained the "professional" status of SLR.

The current single-lens reflective framing method basically means professional positioning, which is also doomed to the "professional" road of digital SLR cameras, so we can often see in profiteer advertisements that even products for ordinary users and enthusiasts have many advantages. At present, digital SLR cameras are monopolized by a few manufacturers, so enthusiasts will mistakenly think that the principle of value for money is the absolute truth in the field of digital SLR cameras. ...

This blindness actually comes from psychology, which often plays a decisive role. Finally, remind everyone that rational consumption is very important. SLR is not necessarily a "professional", and a professional does not necessarily need a SLR. People should look at other emerging photography techniques, soak their heads in cold water and see the imaging effect of the latest ordinary card machine, right? There are many reasons why they can surpass the so-called "SLR"