Opticron Explorer 10x21mm Roof Prism Compact Binocular Non-Slip Rubber Covering Black. Lightweight and compact enough to take anywhere these Binoculars developed by Opticron still pack a punch with the roof prism optical design and multi-coated lenses that expertly transmit light providing brilliant clarity and contrast. Ideal for users with and without glasses the Opticron Explorer 10x21mm Roof Prism All Ages Binocular touts twist-type retractable eyecups that provide a comfortable viewing experience for both adults and children. Fully rubber armored and weatherproof for practical every day use the Opticron Explorer 10x21mm Roof Prism Durable Binocular makes nature exploration a fun and easy experience for everyone. Specifications for Opticron Explorer 10x21mm Roof Prism Binocular: Manufacturer: Opticron Color: Black Magnification: 10 x Objective Lens Diameter: 21 mm Prism System: Roof Prism Material: BK-7 BAK4 Image Stabilizer: No Eye Relief: 14 mm Exit Pupil: 2.1 mm Field of View Linear: 261 ft at 1000 yds Field of View Angle: 5 degrees Optical Coating: Multi-Coated Binoculars Focus System: Center Focus Twilight Factor: 14.5 Interpupillary Distance: 1.4 - 2.8 in Close Focus: 6.6 ft Weather Resistance: None Water Resistance Level: Waterproof Length: 3.6 in Weight: 6.88 oz Finish: Non-Slip Rubber Covering Fabric/Material: Polycarbonate Aluminum Alloy Package Type: Box Included Accessories: Lens Caps Soft case with wrist strap Magnification Type: Fixed Features of Opticron Explorer 10x21mm Roof Prism Versatile Binocular: Limited Lifetime Warranty Compact roof prism optical design Weatherproof Multi-coated lenses with high reflection coated prisms Twist type retractable eyecup assembly Ideal for all ages Fully rubber armored for extra comfort and grip Folds to 3.6x2.5 for easy transport and storage Ribbed focus wheel with 6.6ft close focus Good field of view with or without glasses Package Contents: Opticron Explorer 10x21mm Binocular Opticron 30617: Explorer 10x21mm Roof Prism Compact BinocularBlack