• 42mm large objective lens, high light transmittance, clear and bright image, no color difference, outstanding performance even in glimmer condition • Bak 4 prisms and multi-coated green film optics for superior resolution and image clarity • Durable magnesium chassis is comfortable to hold and rugged enough to stand up to any conditions. • Right eyepiece diopter adjustment knob: there may be differences between the left and right eye vision,can be adjusted using the left eye clarity, then slightly rotate the right eyepiece diopter ring directly to achieve the best results. • Streamline appearance,a strong sense of presence • Waterproof and fogproof - Prevents moisture, dust, and debris from getting inside the binocular