The camera is inverted to reduce the real image. Why do we see an upright image when taking pictures?

For traditional cameras, the inverted image is corrected by a set of prisms and becomes a positive image;

For today's digital cameras, it is even simpler. It can adjust the inverted image through a digital circuit board (equivalent to a microcomputer) to make it stand upright.

The eyeball is imaged on the retina, and then the retina transmits the signal to the visual center for processing, thus producing vision. The camera is shooting, and the negative is upside down, but all the developed photos we see are upside down. You can understand that when the visual center processes information, it turns the image upside down again, so that you can have an upright vision.

Extended data

As far as the function of photography is concerned, a camera should have three structural systems: imaging, exposure and assistance. The imaging system includes imaging lens, ranging and focusing, framing system, additional lens, filter, effect mirror and so on. Exposure system includes shutter mechanism, aperture mechanism, metering system, flash system, self-timer mechanism, etc. The auxiliary system includes a film winding mechanism, a counting mechanism and a film rewinding mechanism.

Lens is an optical system for imaging, which consists of a series of optical lenses and lens barrels. Each lens has two characteristic data: focal length and relative aperture. The viewfinder is a device for selecting scenery and composition. Everything you can see through the viewfinder can be shot on film. A rangefinder can measure the distance of a scene, and it is often combined with a viewfinder. Through the linkage mechanism, ranging can be linked with lens focusing and focus can be completed at the same time.

Optical perspective or single-lens reflective viewfinder rangefinder must be operated manually and judged by naked eyes. In addition, there are photoelectric ranging, sonar ranging, infrared ranging and other methods, which can avoid manual operation, avoid the error caused by naked eye judgment and realize automatic ranging.