Nikon 20-60x Zoom Eyepiece Specifications: Magnification(X): 20-60 Angular Field of view (Real / Degree): 1.9 (at 20x) Angular Field of View (Apparent / Degree): 37.1 (at 20x) Field of View at 1,000m (approx): 33 (at 20x) Exit Pupil: 4.1 (at 20x) Relative brightness: 16.7 (at 20x) Eye Relief (mm): 15.2 (at 20x) Weight (g): 185 Price: £173.00 Quantity: