The binocular head with a quadruple nose piece is a feature of the phase contrast microscope. To maximize light flow, all lenses have been anti-fungus treated and anti-reflection coated. Four objectives are served by a rotating and reversing nose piece. As targets, we employ infinite achromatic phase contrast. A ceramic surface that is shielded from scuffs and marks measures 156138 mm and includes a mechanical stage that measures 7654 mm. A mechanical stage measuring 75x50 mm rack less and equipped with a twin slide holder measures 185x177 mm. The coaxial coarse and fine-focusing knobs allow for fine-tuning of the specimen's focus. an adjustable rack stop is included to lessen damage to the sample and the objectives.
