Preparing system for use Instructions for Use
305935-9900-000–1.3 –2020-08-25-for USA 35 / 65
Parfocal imaging
Parfocal imaging means that the image will remain sharp under different magnifications
once it gets focused under the maximum magnification. Setting the correct diopter of the
eyepiece is critical to ensuring parfocal imaging. If you don’t know the diopter of your eyes
and would not like to wear any corrective eyeglasses during operation, you can follow the
procedure described below to properly adjust the diopter of the eyepieces.
Set MC to maximum
magnification (2.5x). Position
the OPMI head over a piece
of paper with writings on it.
Adjust the height of OPMI to
get a proper working distance
to the paper and then lock the
suspension arm.
Adjust the Varioskop to get
a sharp image of the writing
on the paper. You can
observe the image of the
writing by outputting it to a
monitor with an integrated
camera in the OPMI, or by
directly looking into the
eyepiece if no camera
available.
Set MC to minimum
magnification (0.4x).
Look into each eyepiece with
the corresponding bare eye
and adjust diopter until the
eye sees the writing in sharp
focus. Make sure the working
distance is unchanged during
diopter adjustment.
Set the MC to 2.5x, check if
the image of writing now
remains sharp (i.e. the
parfocal status). If not,
repeat Step 1~Step 4.
Turn the eyecup to the desired
distance.
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