... .3 steps. 3.With controlled pedal 4.motorized focus ophthalmic Operating MicroscopeEyepieces Magnification 12.5x, Pupil distance adjustable range 55mm ... 10x, 16x; Field of view Φ34mm, Φ20mm, Φ13mm Coaxial assistant's binocular tube Manual 3-step changer, total magnification 6x ... new locking wheels Foot switch: Waterproof Weight: 107kg ophthalmic Operating Microscope,5steps,motorized focus (ASOM-3A)