The Helios Lightwing HR roof prism models are bright new stars in the Helios roof prism range which will satisfy even the most discerning user. Comprising six models over 32mm & 42mm objective lens apertures with exotic ED glass options for the 42mm sizes. They are extremely competent instruments providing high-levels of optical performance for both birdwatching & general observing, whilst offering incredible value. The body is constructed from lightweight but robust magnesium alloy & is covered in stylish green protective rubber armouring. All models feature high-index Ba K-4 prisms which are both Phase & Silver Di-Electric coated. Optics are Fully Broadband Multi-Coated with premium extra high-transmission Coatings. These special features combine to provide a light transmission throughput exceeding 90%!! Images delivered are crisp & sharp, with excellent resolution, contrast, brightness & depth of field, with natural levels of colour. The field of view is generously wide with good edge definition. Near focus capability of all models is a highly respectable 2M. Waterproof (30 mins at 1M depth) & nitrogen filled for clear, fog-free operation. Twist-up, 3–position eyecups with metal sub-structure. Suitable for spectacle wearers. Knurled metal, easy-grip focusing knob with about 1.5 turns from closest focus distance to infinity. Integral tripod bush. Supplied with quality neck strap, eyepiece rainguard, objective lens caps & soft case.