The BH2 series of research-level microscopes was marketed by Olympus during the late 1980s and early 1990s. The 160 millimeter tube length optics are configured for Köhler illumination when coupled to LB series objectives and the extensive line of substage condensers. Standard equipment on this microscope included 10x widefield high eye point eyepieces having a field number of 20, precentered halogen lamps, aspherical collector lenses, and fully enclosed light paths designed to exclude dirt and dust. Auxiliary components for the microscope included photoeyepieces, an automatic exposure photomicrography system, and a wide range of objectives covering the entire range of correction and magnification. In addition, both mechanical and circular stages were offered as were binocular and trinocular observation tubes. Contrast enhancing equipment included phase contrast, differential interference contrast, darkfield, fluorescence, and polarized light.