413. Ensure that the aperture diaphragm is completely open. To do so, turn the rotaryknob up (on the right-hand side of the microscope)4. Adjust the dioptre-setting ring in the focusing eyepieces if known, otherwise setit to "0" and do not remove your glasses or contact lenses. The white and red dot standfor "0" (without eyepiece reticule)5. Check that the eyepieces are completely housed in the tube6. Adjust the tube towards eyepiece visualization by pushing in the control bar7. Adjust the interpupillary distance by turning the eyepiece sockets. When lookinginto the eyepieces with both eyes only one unclipped circle of light (object field) shouldbe visible8. Use the SYCOP 3 to focus and zoom the specimen (See ZEN 2.1 (blue edition)Guidelines -> Single Image Acquisition or Visualization)