Drawell B104 LED User Manual - Page 10
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with 10X objective. If the image isn't enough clear with the other objectives,
please turn fine focusing knob slightly to find the satisfactory image.
▲Don't turn left and right coarse and fine focusing knobs with different
direction with power at the same time, if so, the focusing system will be
damaged.
▲Don't directly pull objective to turn nosepiece when user changes the different
objectives, if so, optical quality of
microscope possibly be affected. The
right way is to take the tooth-like part
of the nosepiece to turn it, and make
the objective into correct position and
into the bright path.
4.6 Usage of the tension adjustment
ring (Shown in Fig.6)
The tension adjustment ring can adjust the tension of the coarse and fine
focusing unit to prevent the stage from sliding down automatically and to
improve the comfort of operation. Rotation clockwise makes tension decrease,
and by contraries, rotation counterclockwise makes tension increase.
4.7 Usage of immersion oil objective
The 100X objective of B series microscope can be used for observation even if
without immersion oil. However, adding moderate immersion oil between the
front lens of 100X objective and the cover glass of specimen can make the
image clearer. Please pay attention that air bubble and impurity can't be in the
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