Celestron Verrekijker Nature DX 12x56Objective Lens Diameter (mm): 56 mm Magnification (x): 12x Angular Field of View: 5. 5 Linear Field of View: 289ft 96m@1000yds m Exit Pupil (mm): 4. 6 mm Eye Relief (mm): 16 mm Close Focus : 9. 8 ft 3 m Optical Coatings: Fully Multi Coated Prism Coatings: Phase Coated Prism Glass (Type): BaK 4 Twilight Factor: 25. 9 Relative Brightness: 21. 16 Waterproof: Yes Nitrogen Filled (Fogproof): Yes Interpupillary Distance: 56 74 mm Diopter Compensation: + 3