Metallurgical Microscope Light Source Halogen Optical Field of View 22 mm Optical Magnification 100X to 1000X Maximum Magnification Capability 1000X Vertical Extension 15 1/2 in Horizontal Extension 15 1/2 in Base Dimensions 24 11/64 in x 9 27/32 in Working Distance 20.20-0.40 mm Features Infinite Optical System Polarization Observation Kohler Illumination System Provides Uniform Illumination Field Objectives 50X 100X are Spring Type