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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.
A rangefinder works by having 2 windows that view the subject a slight distance apart. One creates the direct view image in your viewfinder, the other creates a center spot (a small area superimposed on the main image) that's used to focus-this spot is usually somewhat illuminated.ost varieties of rangefinder show two images of the same subject, one of which moves when a calibrated wheel is turned; when the two images coincide and fuse into one, the distance can be read off the wheel. More on camera rangefinders http://www.ehow.com/how-does_4926163_ran...