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An electronic viewfinder (EVF) is a camera viewfinder where the image captured by the lens is projected electronically onto a miniature display. The image on this display is used to assist in aiming the camera at the scene to be photographed.
In a mirrorless camera, light passes through the lens and right onto the image sensor, which captures a preview of the image to display on the rear screen. Some models also offer a second screen inside an electronic viewfinder (EVF) that you can put your eye to. mirrorless camera is better for a casual to semi-serious photographer who wants an all-day carry camera. A serious or pro shooter who wants access to a wider range of lenses and other gear would be better off with a DSLR.