Vortex Optics Nomad 20 - 60x60 Waterproof Angled Spotting Scope with 2.2-1.0 Degree Angle of View, 3.00-1.00mm Exit Pupil & 17-14mm Eye Relief Fully multi-coated optics make every scene brighter and more detailed. BaK-4 high density glass prisms deliver sharp views from one edge of the field to the other. Multi-position eyecup design makes the most of long eye relief for pleasing, wide angled views - even if you wear eyeglasses. Waterproof housing provides complete protection from rain, sleet and snow because of tight O-ring seals. Fog proof with nitrogen purging prevents condensation on internal lenses so you enjoy clear views in spite of sudden temperature changes.