Compensation Free Trinocular Head, Inclined at 30°, Interpupillary 48-75mm. Extra Wide Field Eyepiece EW10×/ 22. Backward Quintuple Nosepiece. Infinite Plane Achromatic Objective 4x,10x,40x,100x. Swing-out Condenser NA 0.9/ 0.25. Double Layers Mechanical Stage 185×142mm, moving range 75×55mm. External Illumination, Aspherical Collector, Halogen Lamp6V/30W. Blue and green filter.