Built to go everywhere you do, the Field Tube is waterproof with a IPX7 rating and fogproof with nitrogen-filled internal chambers, so you never miss a moment of action. Featuring an oversized focus wheel for easy one-handed focusing and a rugged no-slip grip, you won&';t ever want to put it down. Fully multi coated lenses plus a 7 piece (5 group) optical system allows for the best possible viewing experience. Birds, whales, mythical creatures-what will you spot next? Fully Multi Coated lenses: provides both anti-reflection and anti-scratch for a bright, crisp image Rugged Wave Grip: designed to feel great in-hand, provide extra grip and protection Oversized Focus Wheel: for ultra smooth, ultra precise focusing Lightweight Frame: utilizes a medical grade, ultra rugged thermoplastic frame weighing in at only 8.4oz (239g) Waterproof: IPX7 rating means these can withstand submersion in water up to 1 m deep for up to 30 min Fogproof: Nitrogen-filled internal chambers prevent fog formation on the interior surface of the lenses Twist Up Eyecup: can be extended or retracted depending on what works best for the user "No-Matter-What" Lifetime Warranty: encourages you to get out there and roam with confidence! Tripod Compatibility