In a DSLR, there is a mirror in between the lens and the mirror. The mirror is angled so it brings the light coming from the lens to the viewfinder. When you take a picture, the mirror flips out of the way, so the light can get to the sensor. This also means that the camera body needs to be a bit bigger and heavier to accommodate the mirror and related components. A mirrorless camera doesn’t have a mirror and the viewfinder is essentially a tiny monitor that shows the processed image coming from the sensor.
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