National Geographic 8x42 waterproof binocular The 8x42 are very versatile Roof binoculars: waterproof handy and a product of craftsmanship with high quality in mind. Twist-up eyecups adapt the binoculars easily to observers with or without spectacles; diopter compensation is standard.The 8x42 has Bak-4 prisms and is fully multi coated. This allows for color fidelity and high contrast.The objective cap system allows for quick opening and closing; additionally it can be completely removed easily. Furthermore. a tripod connection thread is integrated.