Magnification :5 steps by drum rotation Magnification Ratio:6X,10X,16X,25X,40X Eyepiece :12.5X PD adjustment:50mm ~ 82mm Diopter Adjustment:+7D ~ -7D Slit width :0 ~ 14mm continuous Slit height :1 ~ 14mm continuous Slit angle:0 ~ 1800 continuous 5 magnification with slit inclination