The Opticron Countryman BGA T PC Oasis 10x50 binoculars are a rugged, lightweight roof prism binocular offering all the advantages of internal focusing with textured rubber finish for extra grip and featuring a revised 3-stage retractable eyecup assembly. The Countryman 10x50 also feature, fully multi-coated optical system, including high quality ‘PC’ phase corrected prism units and Oasis prism coating, Long eyerelief eyepieces giving full field of view for glasses wearers, Nitrogen filled construction for waterproofing to a depth of 3 metres and  Opticrons comprehensive 10 year guarantee