The is designed for long distance terrestrial and astronomical viewing. The variable magnification range of the binocular allows the viewer to scan a large field of view and then zoom in on the selected object for a closer and greater detailed look. A zoom thumb-lever makes quick and smooth magnification changes. Fold-down eyecups are incorporated into the eyepieces for comfortable viewing with or without eyeglasses. The 10-30x 50mm Gladiator Zoom Binocular has BK-7 porro prisms and tinted ruby-colored lenses to help lessen ultraviolet glare. Zoom magnification, multicoated optics, large objective, shock-absorbing rubber armor, and tripod-adaptable fittings for a steady view contribute to this binocular that's ideal for all outdoor activities and sporting events.• BK-7 Porro Prisms• Anti-Reflective Multi-Coated Optics• Tripod Mountable• Center Focusing Wheel• Rubber Armoring• Fold-Down Rubber Eyecups• Levered Zoom MagnificationSpecificationsModel Number: AB10168Focus System: CenterPrism Type: PorroPrism Glass: BK-7Magnification: 10x-30xClose Focus: 26'Eye Relief: 15.0 mmObjective Lens: 50 mmExit Pupil: 5.0 mmField of View @ 1000 yds.: 195'Diopter: Right EyeOptical Coating: Ruby Multi-CoatedWaterproof: NoFogproof: NoWeight: 31.75 oz. Finish: Black MatteIncluded Accessories: Carrying Case, Lens Covers, Neck Strap, and Lens ClothMfr. Warranty: Limited Lifetime Warranty Fold-down eyecups for comfortable viewing with or without eyeglasses Tinted ruby-colored lenses help lessen ultraviolet glare Shock-absorbing rubber armor and tripod-adaptable fittings | 10-30x 50mm Gladiator Zoom Binocular in Black