Alpen Alpen Apex 10x50 Binocular BAK4 Multicoated Dark Green Medium Roof. These optical choices maximize light transmission and generate brilliant images with true-to-life color and crisp definition even in low light conditions. All Apex binoculars are waterproof for all-weather performance and purged with nitrogen to prevent internal fogging and keep contaminants like dust and dirt out of the barrels. Each model has a sleek roof prism design that works with the durable rubber armoring to provide a comfortable grip. Additional features include twist-up eyecups and generous eye relief that are ideal for those who wear glasses. Each binocular comes with a deluxe travel case a rubber rain guard and a wide comfortable neck strap. Specifications for Alpen Apex 10x50mm Roof Prism Binocular: Manufacturer: Alpen Color: Dark Green Magnification: 10 x Objective Lens Diameter: 50 mm Prism System: Roof Prism Material: BAK4 Field of View Linear: 341 ft at 100 yds Optical Coating: Multicoated Binoculars Focus System: Center Focus Close Focus: 9.8 ft Weather Resistance: Fog Resistant Water Resistant Mark: 1 m Water Resistance Level: Waterproof Weight: 2.6 lb Magnification Type: Fixed Features of Alpen Alpen Apex 10x50 Binocular Waterproof Fog-proof BAK4 Optics Lightweight Fully Multi-Coated Item Number 618 Magnification 10x Waterproof Yes 1m/30mins Field of View 341FT / 114M Lens Coatings Fully Multi-Coated Focuser Type Center Objective Lens Diameter 50mm Close Focus 9.8FT / 3M Prism Roof/BaK-4 Eyecup Type Twist-Up Weight 2.6LB / 1179G Package Contents: Alpen Alpen Apex 10x50 Binocular Bag Lens cleaning tool Cleaning Pen Alpen 618: Alpen Apex 10x50 Binocular BAK4 Multicoated Dark Green Medium Roof