... /16xTotal Magnification and10x(Φ18) 16x(Φ14.5)Field of View(mm)16x(Φ11.5) 25.6x(Φ9)Range of Pupil Distance(mm)55-82(10x ... ) 51-78(16x)Adjustment of Diopter±8D(10x) ±10D(16x)Slit Width(mm)0~9 ... °,15°,20°, 4 ranges chooseLight Spot DiameterΦ9,Φ8,Φ5,Φ3,Φ2,Φ1,Φ0.2Filterheat absorption, grey, redfree,cobalt blueIllumination Bulb12V/30W ...