Achieve bright, true-to-life and accurate views of your subjects through the Nikon ED50 S Monocular Fieldscope Eyepiece with Zoom. This fieldscope eyepiece uses Nikon ED glass for razor sharp imagery, high-detail resolution, and elimination of flare. The O-ring sealed and nitrogen purged design of this eyepiece makes it waterproof and fog-proof. Using high-grade optics and full multicoating technology with anti-reflective compounds, this Nikon eyepiece delivers bright and crystal clear views. It offers an eye relief of 12.9mm for comfortable viewing. You can use it with all models of Nikon Digiscoping equipment.