One of the major features of DSLR cameras is that they are equipped with an optical viewfinder, which allows the photographer to see the subject in real time. When the shutter is pressed at the desired time, a mechanical shutter consisting of 2 shutter curtains-the first curtain and second curtain-controls the shutter speed (the start and end of exposure) to capture the photo. The light is reflected without distortion in a pentaprism, a 5-sided prism positioned above the mirror, and then inverted before reaching the viewfinder, allowing the photographer to see the image as it will be captured. The light (image) that passes through the lens is reflected by a mirror placed in front of the shutter curtain. Since the optical viewfinder shows the live subject as is, the photographer can match the timing of the shutter release with the subject. The prism reflects the view captured by the lens onto a mirror (reflector) inside the camera. The optical viewfinder allows the photographer to see the movement of the subject in real time through a mechanism called a “prism” built into the top of the camera. There is a big difference between the viewfinders of mirrorless cameras and SLR cameras. The viewfinder is used by the photographer to actually confirm the image they want to capture. Mirrorless cameras are used to take pictures while viewing and checking the image through an electronic viewfinder.
Figure 1 (top): How an SLR camera works, Figure 2 (bottom): How a mirrorless camera worksĪn SLR camera contains a mirror (also called a reflector) while a mirrorless camera does not.Īs shown in Figure 1, an SLR camera has a mirror that reflects the light entering the body through the lens, and resulting image is then checked directly through the optical viewfinder.Ī camera with no mirror (a mirrorless camera)Īs shown in Figure 2, light entering the body through the lens is converted into images via the image sensor and image processor.
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