Description
A mirrorless camera is a camera that does not have a mirror. Though most cameras, including those used in smartphones, lack mirrors, the term mirrorless is primarily used to describe digital interchangeable lens cameras, in order to distinguish them from DSLRs, which have historically dominated interchangeable lens cameras. Lacking a mirror system allows the camera to be smaller, quieter, and lighter.
In cameras with mirrors, light from the lens is directed to either the image sensor or the viewfinder. This is done using a mechanical movable mirror which sits behind the lens. By contrast, in a mirrorless camera, the lens always shines light onto the image sensor, and what the camera sees is displayed on a screen for the photographer. Some mirrorless cameras also simulate a traditional viewfinder using a small screen, known as an electronic viewfinder.
DSLRs can act like mirrorless cameras if they have a "live view" mode, in which the mirror moves out of the way so the lens can always shine onto the image sensor.
Many mirrorless cameras retain a mechanical shutter. Like a DSLR, a mirrorless camera accepts interchangeable lenses. Mirrorless cameras necessarily have worse battery life because they need to power the screen and sensor at all times.
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