Carson&reg; Trek 8x21mm Compact Roof Prism Binocular (TK-821) Magnification: 8x | Objective Lens Diameter: 21mm | Weight: 7.0 oz. Prism Type: BK-7 | Fully Coated Lenses | Eye Relief: 10.5mm Extremely Compact, Durable and Lightweight | Field of View: 365 feet at 1,000 yards Included with Pouch, Neck Strap and Lens Cloth Includes No Fault, No Hassle Warranty