Prism Binoculars Magnification 8x. Objective Lens Effective Diameter - 25mm Real Field Of View - 6.6° Apparent Field Of View - 52.8° Objective Lens Construction - 4 Elements In 3 GroUPS Eyepiece Lens Construction - 4 Elements In 3 GroUPS Exit Pupil Diameter - 3.1mm Eye Relief - 13.5mm Eye Width Adjustment - 56mm ~ 72mm Focusing Method - Manual Focusing By Turning The Focusing Knob Closest Focusing Distance - 3.5 Meters/11.5 Feet Image Stabilizer Tilt System With Corrective Optics Correction Angle ±1.0°.