The Styrka 10x42mm S9 Roof Prism Binocular boasts optical performance second to none. They are the ideal product for the avid outdoorsman that wants the best and is not willing to compromise. The highlight of this model is the Extra Low Dispersion (ED) objective lenses that nearly eliminate chromatic aberration and the high grade SK15 prisms that increase brightness and contrast. This optimized optical system provides prolonged use at dawn and dusk and will help you determine if that slight movement in the distance was the wind or a Boone and Crocket buck. Fully multi-coated optics with Styrka's proprietary SXL-MAX flat multi-coating and dielectric and phase coated SK15 prisms increase light transmission through the entire optical path for bright, high contrast images with jaw-dropping clarity and resolution. On top of all this the Styrka 10x42mm S9 Roof Prism Binocular features an ergonomic open bridge design that provides an improved grip and increased steadiness. All models are fully waterproof and nitrogen purged for use in any weather condition. The Styrka 10x42mm S9 Roof Prism Binocular is the model of choice for the nature lover that is looking for world class optical performance with the ability to bring animals in closer for a more detailed view.