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If you hold the down button the zoom will became 1x, if you hold the up button the zoom
will became 4x centered on the selected pupil.
If you want to change pupil you have to press the right and the left buttons that allows you
to choose on wich of the two pupils the zoom will take place.
You can center and zoom another image detail by selecting it with the Pan function and
then adjusting the zoom power by the up and down buttons.
The zoom function centers automatically the selected pupil but in case of changing
to the Pan function the zoom will leave the the pupil center and the system will point
to the new position selected by the PAN function.To return to the automatic zooming
on the pupil you have to press one of the right and left buttons.
Pan Function
The pan function allows you to locate any detail of the image. After selecting it, you have to
use the arrow buttons to browse in the image. For a rapid movement you have to hold the
arrow (joystick) button to the direction you want. After positioning on the detail you can
change the function to choose the zoom power you want by the up and down buttons
without losing the center of the image.