To ensure proper focus across zoom levels when using a microscope: 1) Set the pupillary distance and diopter registers; 2) Zoom to highest magnification and focus; 3) Zoom out and adjust diopter registers; 4) Repeat for second microscope head. Following this process allows both users to independently zoom in and out without refocusing.

1. FOCUS YOUR MICROSCOPE PROPERLY
It is possible to assure focus throughout the zoom range if the following procedure is used:
Working first with Microscope Head A:
Set your pupillary distance by turning the knob by the eyepiece to be sure you are
1) using both eyepieces. The number between the eyepieces shows you your
pupillary distance so you may set that number each time you use the microscope.
2) Set the diopter register on each eyepiece to Zero
3) Zoom to the highest magnification via the Zoom-In control on the footswitch/
handswitch.
4) Focus the microscope via the Focus-Up / Focus-Down controls on the
footswitch/handswitch until the image is sharp.
5) Zoom to the lowest magnification via the Zoom-Out control.
6) Adjust the diopter register on each eyepiece individually to attain the sharpest
image.
Head B should then be focused by adjusting the diopter register on each of it's
eyepieces. If the procedure is followed, both surgeons can zoom in and out
independently without having to refocus.
NOTE: The Z880 Medlink USA Model users have an additional manual B-Side fine
focus. After following the above procedures (1 - 5) the B-Side surgeon can manually
fine tune the focus with the two opposing knobs at the bottom of the B-Side head.