Carson OperaView 4x10mm Ultra Compact Binocular (OV-410) Magnification: 4x | Objective Lens Diameter: 10mm | Prism Type: BK-7 | Ultra Compact and Lightweight Fully Coated Lenses | Eye Relief: 13mm | Field of View: 525 feet at 1,000 yards Weight: 2.2 ounces | Product Dimensions: 3.5 inch x 0.5 inch x 2.0 inch | Center Focus Knob for Maximum Focusing Flexibility Included Accessories: Pouch, Neck Strap and Lens Cloth | Perfect for the opera, theater, sporting events or concerts Backed by Carson's No Fault, No Hassle Warranty