A rugged time tested design with true Koehler illumination and high quality optics, suitable for day-to-day use in the laboratory, clinic or classroom. The options below are combined into twelve standard configurations to suit a wide range of biological applications and budgets.   VIEWING HEADS Available with standard binocular for photomicrography, 30° inclined eyetubes with adjustable diopter settings and interpupillary distance, 360° rotatable.   EYEPIECES Paired DIN KHW10x, FN 20.   OBJECTIVE CHANGER Smooth-operating, ball bearing mounted, quadruple nosepiece.   OBJECTIVES S.Flat Brightfield 4x, 10x, S40x, S100x oil S. Flat Achromats, SM Planachromats, Planachromats, or Phase Contrast.   STAGE Attached mechanical stage: 120mm x 140mm surface with 75mm (X) by 40mm (Y) movement, graduated with vernier readings to 0.1 mm, drop-down right or left-handed controls. Flat-top stage: 171mm x 140mm surface with 80mm (X) by 52mm (Y) movement, graduated with vernier readings to 0.1 mm, detachable specimen guide, drop-down right of left-handed controls.   CONDENSERS Standard models have either an Achromatic NA 1.25 condenser with iris diaphragm and filter tray for brightfield work, simple NA 1.25 slider phase condenser, or an NA 1.25 Zernike phase condenser with filter tray and independently centerable annuli for phase contrast. Cardioid-type NA 1.25 darkfield condenser for high power (100x objective only) darkfield work is optional.   ILLUMINATOR Built-in, 6V 30W, variable-intensity Koehler illumination for apertures up to 1.25.

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