Nikon Prostaff 5 10X 50mm 293 ft @ 1000 yds FOV 19.6 mm Eye Relief Black 7572 The Nikon Prostaff 5 Binoculars Are Lightweight And Durable Binoculars Made With a Fiberglass-Reinforced Polycarbonate Resin Body And Multilayer-Coated lenses. The Prostaff 5 Binoculars Are Nitrogen-Filled And O-Ring Sealed For Complete Waterproof And fogproof Performance. Specifications: Magnification: 10X Objective: 50mm Field Of View: 293 ft @ 1000 yds Eye Relief: 19.6 mm Exit Pupil: 5mm Short Focus: 16.4 ft Prism Type: Roof Weight: 28.7 Oz Finish: Black Case: No Eyeglass Suitable: Yes Focus Type: Center Coatings: Multi-Coated Proofs: Waterproof, Fogproof