Both side co-axial focusing knobs. Quadruple revolving no sepiece with accurate centering & positive click stops. Large Co-axial Mechanical Stage for X-Y movement of specimens. Bright field vertical illuminator 6V-20W Halogen with field & aperture diaphragm, filter slots and bulb centering mechanism. Achromatic Objective: M4X-M10X & M40X. Eyepiece: Hug. 5x or WF 10x.