Barr and Stroud Skyline 8x42 WP Roof Prism Binoculars is best for bird watching, travelling and for other different applications. The Skyline 8x42 provides high definition images that will satisfy the basically sharp and experienced observer. It had 42mm objective lenses delivering stunning images in low light conditions.With its 8 times magnification it aloows you to have bigger fields of view and easy to chase birds. Barr & Stroud 10x42 Skyline on the other hand best for huntinga nd wild life safari with bigger magnification\nIts rubber armoured body protects it from rain, moisture, dust and any kind of shocks. This binocular is waterproof up 1.5 meters of water up to three minutes and nitrogen filled to remove internal fogging. The twisted-up eyecups ring with adjust provide the most relaxing long eye relief of 17.8mm for viewing with or without glasses. Its central focusing mechanism provides protection against dust penetration. It had a feature of dioptre adjust for those why