... change: Revolving DrumTotal magnification Ratio: 10X, 16X, 25X(standard configuration)6X, 10X, 16X, 25X, 40X (professional configuration)Eyepieces 12.5XAngle between eyepieces ... adjustment: 52mm~78mmDiopter adjustment: ±6DField of view: 40X (Æ5.5mm), 25X (Æ8.5mm), 16X (Æ13.5mm), 10X (Æ22mm), 6X (Æ34.7mm ...