Microscope                                    3 Step Slit Lamp Microscope   Magnification Changer                   Drum rotation Working Distance                           100 mm Objective Lens Focal Length          f 100 mm Eye Pieces (Large Optics)              12.5x Total Magnifications                        10x, 16x, 25x Real Field of View                           27, 16, 11 mm   Inter Pupillary Distance                   55 - 75 mm Diopter Adjustment Range             -6 D to +6 D Slit image Width                              0 to 14 mm continuously variable Slit image Height                             0 to 14 mm continuously variable Illumination Field Diameter in mm   0.2, 2, 3, 4, 6, 8 & 14 mm Slit Rotation                                     0° to 180°   Slit Inclination                                   5°, 10°, 15°, 20° Sclerotic Scatter Knob                     for Indirect illumination & Retro illumination Filters                                               Yellow , Red Free , Neutral Density , Cobalt Blue , Diffuser Illumination                                      12 V- 50 W Halogen lamp / 3.4 V-700 mAh LED Operation 3 Dimensional single handed operation Instrument base movement 99 mm (in/out), 30 mm (up/down),118 mm (left/right) Physical Parameters Dimensions L x W x H )              725 x 460 x 555 mm Weight net                                   20 Kg and gross 27 Kg (approx) Chin rest movement range         120 mm Electrical Specifications Power supply                                ~110-230 V, 50-60 Hz Power consumption 45 W (Halogen) / 2.4 W(LED)