The 15x56 SLC Binoculars from Swarovski combine extra-low dispersion (HD) glass elements and a range of proprietary optical coatings with a weather-resistant magnesium-alloy housing to create a multi-purpose set of glasses that delivers impressive image quality and durability. This configuration of the SLC displays an immersive 62Adeg apparent viewing angle; a long 16mm eye relief and multi-position twist-up eyecups enable a comfortable viewing distance for almost any observer. Fluorite-Containing HD Glass Elements Roof Prisms with Phase Correction SWAROBRIGHT, SWAROTOP, SWARODUR Coatings Wide-Angle Viewing Nitrogen Filled Fogproof/Waterproof Open-Bridge Configuration Magnesium-Alloy Housing, Rubber Armored Mechanical Center Focus System May or may not include accessories.