The Olympus 12x50 EXPS I Binoculars: Reach for the Stars with these Pro Grade Binoculars Aimed at Nature and Travel Lovers.- High index BaK-4 porro prisms for bright crisp edge-to-edge images- Fully multi-coated lenses for maximum image brightness and contrast- Long eye-relief with twist-up/down eyepieces- Non-slip rubberized coating and grips for a sure hold- New ergonomic contoured design- UV coating for care-free viewing- Large centre-focus knob for fast and easy focusing- Built-in dioptric correction adjusts to individual eyesight