Objective Plan Infinite Achromat 4X, 10X, 40X, 100X EYEPIECES WH 10x (FN 20mm) paired eyepiece with eyeguards. The unique optical design provides relief from eye fatigue and renders wide-field images of utmost clarity. Compatible with optionally available eyepiece micrometer. DIOPTER CORRECTION Dioptric adjustment available on the left eyepiece tube OBSERVATION HEAD Binocular head (30 degree inclined seidentopf), 360 degree rotatable, with diopter adjustment on the left . Interpupillary distance 48-75mm. MECHANICAL STAGE Co-axial low drive mechanical rackless stage 120 mm x 132 mm with traverse area of 76 mm x 30 mm with single slide holder. FOCUSING SYSTEM Co-axial coarse and fine controls with a focus adjustment and fine adjustment knobs. Coarse focus range 20mm. Fine focus rotation 0.25mm.