Green SII Fully Multi-Coated Roof Prism Binoculars from Sightron - SIIBL832 The Sightron 8x32 SII Blue Sky Series Binocular is a great choice for optics when premium performance is on a budget. It is ideal for all outdoor activities from Field Specialist to bird watching. It has fully multicoated optics with BAK-4 phase coated prisms for maximum light transmission and superior resolution. The twist up eyecups are a bonus feature for eyeglass wearers. It has been designed for the performance-minded sportsman. SII Big Sky Twist Up/Down Eyecups Twist-up and twist-down eyecups are standard on all SII Big Sky binocular models. Simply twist-down for eyeglass wearers and twist-up for non-eyeglass wearers for perfect eye relief. SII Blue Sky Lenses Featuring fully multi-coated lenses throughout the binocular providing maximum light transmission and superior resolution for edge to edge clarity of the glass. Fully Multi-Coated Fully multi-coated lenses employ coatings on both surfaces of our precision ground glass to provide the maximum optical quality. Waterproof Rain, snow or humidity, Sightron optics are built using 100% sealed system ensuring a lifetime of performance in the most extreme environmental conditions. Nitrogen Gas Charged Nitrogen filled to provide a lifetime of use from fogging and internal water buildup.