VicTsing Mini Binoculars,8x30 BAK4 Prism Telescope with Neck Strap and Soft Protective Bag-Black Advanced BAK4 Prism. BAK4 prism owns higher index of refraction than BAK7 prim. With perfect light transmittance, these binoculars provide you bright and vivid images without black background. 30-millimeter Lens Diameter. Designed with ultra wide angle optics system, it will bring you broader field of view. Up to 70 degrees field angle, these binoculars provide 30% larger visible area than that of normal binoculars in the market. 8X Magnification. If you get any higher magnification than 10X, they are difficult to handhold. 8X is the perfect magnification which is universally adopted in military binoculars. You can see your targets farther and more clearly in this magnification. Fully Multicoated(FMC) Optical Lenses. This feature guarantees superior light transmission and brightness. Up to 99.5% transmittance, it will take you to into a clear and bright world in which you can appreciate fantastic landscape. Elaborate and Exquisite Design. Made out of high quality material, with nonslip rubber protective layer, it has the features of skid proof and shock absorption. Sturdy and durable, this product is perfectly suitable for recreational use such as stadium sports, bird-watching, concerts, hunting, hiking, etc.