G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/14—Viewfinders
G—PHYSICS
G02—OPTICS
G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
G02B17/00—Systems with reflecting surfaces, with or without refracting elements
G02B17/02—Catoptric systems, e.g. image erecting and reversing system
Systeme optique a reflexions pouvant etre adapte a l'appareil photographique, camera ou television permettant d'obtenir la reduction et la reproduction d'un espace avec perception du relief