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G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
Afocal glasses, magnifying spectacles, telescope cupolas, cupola segments or the like and combinations with optical systems known as weak binocular with large field of vision, good image definition and high light efficiency