These Nikon 16x50 Action Binoculars are equipped with multiple layers of antireflective coating and traditional Porro-style prisms, which deliver clear and high-contrast views. Porro prisms are not merely a nod to the past; many users of optical devices believe they provide a superior sense of '3D' depth perception compared to the slimmer and more prevalent roof prisms. The large 50mm objective lenses possess excellent light-gathering capabilities, ensuring bright and clear images even in difficult conditions such as dawn or dusk, or when looking into thick underbrush. The turn-and-slide eyecups, along with comfortable eye relief, facilitate easy viewing without causing eye strain, particularly during extended observation periods. Optical Performance Traditional Porro prism light path produces a rich depth of field, allowing the user to discern the relative distances between objects in the view Anti-reflection multicoated optics produce neutral and accurate color fidelity and improve contrast and image brightness 60.8° apparent angle of view reduces the appearance of visible hand shake, which is especially common with higher-power optics Use and Handling Large slip-resistant center focus wheel is easy to manipulate, even while wearing gloves Right-eye dioptric correction compensates for individual user's optical prescription for clearer and sharper views Turn-and-slide eyecups for comfortable use with or without eyewear