high resolution 0.6-5.0X zoom lens.1:8.3 big ratio.Parallel infinity optical system. 0.3X.0.5X.1X.2X.3X CCD adapter optional. 0.3X.0.5X.0.6X.1X.1.5X.2X objective optional.Available to observe different objects by using LED illumination,coaxial light,polarized light and  fiber optic illumination.