... .5)Field of View(mm)16x(Φ11.5) 25.6x(Φ9)Range of Pupil Distance(mm)55-82(10x) 51-78 ... Diopter±8D(10x) ±10D(16x)Slit Width(mm)0~9 adjustableSlit Height(mm)1~8 adjustableSlit Angle0°~180°Slit Inclination5°,10°,15 ... °,20°, 4 ranges chooseLight Spot DiameterΦ9,Φ8,Φ5,Φ3,Φ2 ...