The exceptional performance that the Steiner Nighthunter XP Binoculars optic delivers is due to the index-matched glass and coatings that incorporate rare-earth formulations of titanium, fluorite and other mineral substrates. The result is not only best-in-class light transmission and remarkable brightness, the images are crisp and sharp with edge-to-edge contrast and resolution. You can count on high resolution edges under any light or weather condition. The roof prism system contains a specially developed dielectric mirror with a vapor-deposited phase correction coating transmits up to 99% of incoming light. This high-tech process guarantees precise detail and true colors.