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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.
The focusing method used when looking through the viewfinder, not the LCD. In the Canon T4i when you focus through the viewfinder you use what I call the big brains of the camera and the focusing method used is called Phase Detection. So how does the two new STM lenses compare with a USM. Real Quick Definitions.