APEXEL 10-30x50 Premium Binoculars Outdoor Zoom Binoculars Telescope Lens Product features: [Professional Binoculars]-Design of Bak7 prism and multilayer coating provide better image brightness, contrast and quality. Compared with Bak-9, Bak-7 prism has better performance.Its refractive index is higher and it can effectively avoid dark angle.So that its imaging is more clear and bright. [10-30x50]- The large eyepiece has a better view and a wider viewing range.50mm larger objective lens has more light, higher brightness and wider field of vision.If the objective size is less than 41mm, then there will be dim vision and dark corners. [Durable Body] -Environmentally friendly rubber with wear-resistant and moisture-proof accompany you to explore the world.The skid design based on the principle of camera appearance gives you a more comfortable grip. [Easy Focusing]-The binoculars is easy to focus on the goal. You can adjust the centre-focus knob of the compact binoculars to get a clearer view. It can also be installed on a tripod.So it is convenient when you watch something for a long time. Specifications: Brand: APEXEL Model: 10-30X50 Field of view range: 235FT/1000YDS Magnification: 10-30 times Eyepiece diameter: 22mm Objective lens diameter: 50mm Lens coating: FMC Prism material: BAK7 Adjustment method: central focus Waterproof grade: life waterproof Prism system: Paul Telescope material: metal + rubber Size: 184x184x62mm Package Contents: 1*Binoculars 1*lens cleaning cloth 1*binocular strap 1*Eyepiece dust cover 1*Objective lens dust cover 1*Portable storage bag 1*Instruction