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Binocular prisms - why are they so weird and different? - Telescopes, Binoculars, Microscopes & Telescopics Sights
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Praktica Falcon 10x50mm Porro Prism Field Black Binoculars - Fully Coated Lenses, Sturdy Construction, Aluminium Chassis, Sharp Clear Image, Bird Watching, Sailing, Hiking, Sightseeing, Astronomy: Amazon.co.uk: Electronics & Photo
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