GPO Passion HD 10x50 BinocularGPO Passion HD 10x50 Binoculars provide nearly 42% more light input than the Passion HD 10x42 and still deliver 91% light transmission thanks to Double HD objective lenses (extra low dispersion lenses that are chemically laminated to create a single multi layer high performance lens), GPObright lens coatings which pass 99. 7% of the light that passes through each air to glass surface. This process reduces surface light reflections, enhances resolution