A view finder is disclosed which uses an optical or frame-type view finder and an electronic view finder in combination. In the view finder, the image forming surface of the optical or frame-type view finder and the picture image surface of the electronic view finder are maintained in an optically equal...http://www.google.fr/patents/US5161025?utm_source=gb-gplus-shareBrevet US5161025 - Optical/electrical view finder
