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With the zoom lens, you can
change the magnification
without losing sight of the
target you are observing.
Also, you can easily set the
optimal magnification that
provides the clearest image. |
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The lens magnification must be
changed by turning the revolver,
so the target point may disappear
from the visual field. Optical
microscopes require time for
adjustment when you wish to
view a further-magnified image. |
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