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Compact and lightweight with 50mm ED (Extra-low Dispersion) objective lens to minimise chromatic aberration and deliver superior contrast and colour reproduction Multilayer-coated lenses and prisms reduce internal reflections and flare to produce sharp, clear views Waterproof (up to 1m for 5 minutes) and fog-free with O-ring seals and nitrogen gas for added resistance to the elements 55mm filter can be attached to objective lens Compatible with Nikon Digiscoping System