What is multiple exposure in photography?

Multiple exposure is one of trick photography's methods. The basic principle is that multiple exposure memories, with masks, do not overlap each other, or without masks, can overlap each other. By taking more than two exposures to complete a picture, subjects that should not be together in time and space can be organically combined into a picture. The basic principle is that the memory of multiple exposures does not overlap with the mask, but can also overlap with the camera. One way to do multiple exposures is to open the shutter and flash with strongpoint at the same time, or use several flash lamps to flash continuously in front of the lens to adjust an auxiliary shutter-an opaque disk with holes can also get multiple exposures. In order to separate the negative image slightly, it is necessary to move the object, camera and zoom lens or any two at the same time. The second more common multiple exposure method is to open the shutter once per exposure. Exposure In the process of taking pictures, both the camera and the subject remain motionless, so it is necessary to expose the subject for many times without time and light, which can improve the layering of the subject. This is the most fundamental multiple exposure technology, which is more suitable for shooting night scenes and changing the focal length. By changing the focal length of flowers or still life, you can make two multiple exposures, one using real focus and the other using virtual focus. Exposure is getting less and less when shooting in virtual focus. The so-called occlusion method is to cover half of the lens to shoot the subject once, and then cover the other half to shoot the misplaced subject once. This allows the subject to be exposed to a negative at the same time, without covering the lens when shooting with a digital camera. Just take two pictures It should be noted that the position of the lens must be maintained. There is also the superposition method of multiple exposures. One way is to reserve positions in some areas of the picture in advance, and multiple exposures in the reserved areas can also form very expressive consequences. During shooting, the position of the camera can be fixed or moved. Here, we take multiple photos of a person in multiple positions by fixing the position of the camera, and then combine them together. In the era of digital cameras, because of technical reasons and the convenience of digital post-synthesis, the function of multiple exposures has been gradually ignored by manufacturers, even in professional series. Many code SLR cameras do not have the function of multiple exposure. Although multiple exposure is rarely used in daily shooting, it is extremely effective in some special occasions, such as fireworks shooting and night scene shooting. Digital camera has powerful post-processing advantages that traditional cameras can't match. In Photoshop, you can easily achieve multiple exposures by superimposing several photos, that is, two or more films with the same background are placed in the same picture in a multi-layer way, and then become bright when the layers are mixed.

Mode can achieve the consequences of multiple exposures.