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Barr & Stroud Sierra Roof-Prism 10x50 Binocular: The Barr & Stroud Sierra Roof-Prism 10x50 Binocular feature rugged construction combined with brilliant optics. They are waterproof to a depth 1.5m of water for three minutes. Barr & Stroud Sierra Roof-Prism 10x50 Binocular are filled with nitrogen gas which keeps water out and also protects the optics suffering from internal fogging in unfavourable weather circumstances, this binocular is truly weatherproof. Completely Multi Coated optics is standard features of the Barr & Stroud Sierra Roof-Prism 10x50 Binocular range as are BaK-4 phase coated prisms. This degree of complexity guarantees that as much light as possible is transmitted through the optics which results in fantastic bright contrast rich images of high colour fidelity for the user even in low light conditions
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