Our premier laboratory metallurgical microscope, the NMM-820TRF is versatile enough to excel in most any industrial or institutional application. High-resolution optical system features infinite plan achromatic objectives Available magnification ranges from 50 to 1000x (dry objective) Long working distance – up to 3.7mm with 40x objective Infinity plan achromatic objectives: 10×/ 0.25/ ∞/ – (BF/DF) 20×/ 0.4/ ∞/ 0 (BF/DF) 40×/ 0.65/ ∞/ 0.17 50×/ 0.75/ ∞/ 0 (BF/DF) 100×/ 0.8/ ∞/ 0 (BF/DF) Kohler halogen illumination with aspherical condenser Illumination options include bright-field, dark-field, polarization and more Double-layer non-porous mechanical stage Ergonomic design and control placement optimizes ease and comfort of use Precision camera and measurement options available Seidentopf trinocular viewing head Extra-wide-field 10X – 22 eyepieces