Barska Colorado WP 10x42 Binoculars Designed for Bird Watching, Nature Observation, Hiking, Camping, Hunting, Sporting Events and Much More Fully phase coated roof prisms deliver clear and crisp images 100% waterproof and fog proof. Exit Pupil: 4.2 mm, Eye Relief: 13.6 mm Twist-up eye-cups and center focusing system. Objective Lens: 42mm Field Of View (ft./m): 305/102