... : 12.5X Magnification Ratio:6X(Ø33),10X(Ø22.5),16X(Ø14),25X(Ø8.8),40X(Ø5.5)Range of Pupil Distance: 55mm-75mm Adjustment ... of diopter: -5~+3D Slit Width: 0mm-9mm adjustable(slit ... °adjustable Aperture Diameter(mm): Ø9,Ø8,Ø5,Ø3,Ø2,Ø1, Ø0.2 Slit Inclination: 5°,10°,15°,20°Filter:heat absorption,grey ...