Binoculars Image-stabilized binoculars Binoculars Building Orion Telescopes & Binoculars Opera glasses Tower viewer Trinovid Perger prism Abbe–Koenig prism Swarovski Optik Porro prism Schmidt–Pechan prism Steiner-Optik Uppendahl prism David Blair (mariner) Globe effect Monocular First World War glass–rubber exchange Vortex Optics Bushnell Corporation Butterfly watching David P. Bushnell Exit pupil Inverted binocular phenomenon Roof prism Explore Scientific Tasco Barr and Stroud Finnstick NGC 1027 NGC 2354 Lunar observation NGC 2301 Blaser A View from a Hill (A Ghost Story for Christmas) NOBLEX E-Optics GmbH NGC 6939 Bresser Shacolas Tower Charles Frank Ltd Celestron Porro–Abbe prism Jef…

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