These Nikon 8x42 Action Binoculars have multiple layers of antireflective coating and traditional Porro-style prisms to provide clear, high contrast views. Porro prisms aren't just nostalgia—many optics users find they offer a better sense of "3D" depth perception than the slimmer and more common roof prisms. The light-gathering ability of the large 42mm objective lenses helps to ensure bright and clear views, even in challenging situations like at dawn or dusk, or when peering into dense underbrush. Turn-and-slide eyecups and a comfortable eye relief enable easy viewing without eye fatigue, especially during long observation sessions.