Zoom Ratio of 12 : Stepless Magnification Change from 349.8x to 4200x without changing lens (with objective ZC70). It is possible to reach the observation position quickly at low magnification and magnify the image then and there to the maximum. DZ4 can be used with various types of illuminations. It has a wide application. The resolution is so high that a very clear picture is available even when the microscope is used with a large monitor.