Nikon Right Angle Viewfinder (F/F2/Nikkormat/Nikomat)
Screwed into the eyepeice thread of either the Eye-Level or the Photomic Finders, permits waist-level viewing, or if necessary, from any angle 90 degrees off the camera's optical axis. Combined magnification, apporx. 0.6X with a 50mm lens. Range of dioptry adjustment, -5 to +3 diopters.