Designed to appeal to optics users who value tough construction and reliable optical performance. They are waterproof and fog proof for even the most extreme conditions and have turn and slide rubber eyecups. Also features a BAK4 high index porro prism. These binoculars are suitable for astonomy, bird watching, hiking and watching sporting events. Centre focussing to allow you to quickly and easily adjust to different focal ranges. Roof prism. Lens diameter of 40mm. Magnification 8x. ...