The Extreme model made by Delta Optical with 7x50 configuration is a highly durable and very bright binocular. If you are looking for binoculars for marine applications, this is the right place for you! 7x magnification gives you still enough detail and eliminates sea sickness that occurs on boats, and 50 mm objective lens helps you with perfect brightness even during twilight hours. These binoculars have a Porro prism design and multi-layers of high-quality FCM coating that also gives you incredible resolution free of major distortions such as chromatic aberration. They have a wider field of view that helps you to easily track and stay on the target. The Extreme 7x50 is of course extremely durable with tight seals and individual focusing mechanism instead of central, that helps to make them waterproof. They are also purged with nitrogen gas so internal glass fogging will never be a problem due to temperature fluctuations. Enclosed in rugged rubber armoring, these binoculars won’t yield due to sudden impacts and will provide you with safe firm grip that won’t accidentally slip out of your hands. They work from -40 to 70 °C. Eyepieces are comfortable when pressed to the face and cut the light from the sides.