The Kowa Genesis Series XD 10x33mm Binoculars are the first binoculars to use the PROMINAR brand name, utilizing four XD lenses. These high performance Kowa Genesis XD 10x33 Binoculars use the technology of the TSN-880/770 series spotting scopes. They pair XD lenses with convex lenses made of glass with special dispersion properties to reduce chromatic aberration to a further degree. This advanced technology creates a bright image with high contrast and remarkable color reproduction than can not be duplicated by a normal achromatic lens. Kowa Genesis Series 10x33mm Binoculars w/ Prominar XD Lens feature new coatings provide precise color definition for improved viewing pleasure. The new wide angle eyepiece design of the Kowa Genesis XD 10x33mm Wide Angle Binoculars has increased the field of view of the 8x by 28% (140m/yds at 1,000m/yds) & 10x by 14% (119m/yds) when compared to the BD32 Series binocular.