An electronic microscope, in particular a surgical microscope, comprises a camera unit that has at least one electronic image sensor for generating primary image data sets and that comprises an imaging optics for generating an image of an object on the image sensor. The microscope further comprises an electronic viewfinder, an adjustment device for varying a focal position of the camera unit, a control device, and a computing device. The control device is adapted to control the adjustment device to make a cyclically repeating variation of the focal position of the camera unit between a plurality of focal values and to control the image sensor to generate a respective primary image data set for each of the plurality of focal values. The computing device is adapted to determine a secondary image data set from the primary image data sets generated for the plurality of focal values, said secondary image data set having an extended depth of field relative to the respective primary image data sets.
