Bestscope International Limited
BS-2090
5-2 The installation and use
5-2-1
Installing the phase contrast slider
（
fig.28
）
1. Keep the slider
①
face ( the surface which had
character) up towards, then inserted it into the
illumination system from the right to the left
like the figure showed.
2. Every light ring or opening has its own
located position, so you need to move them
until you heard the “clicked” to ensure the ring
or the opening reache the center of the light
path.
3. When in the phase contrast observation, do
keep the aperture diaphragm adjustment
lever
②
on the position of “O” (wide opening).
5-2-2 The centering ring
（
fig.29 and fig.30
）
★
Usually you needn’t the operation of
centering. If necessary, please accord to the
following steps:
1. Place the specimen on the stage and focus it.
2. Take out the eyepiece, replace it with the CT
(the centering telescope),and inserted it into
the viewing tube without diopter adjustment.
3. Make sure the matched phase contrast objective
and light ring (in the phase contrast slider)
have been in the center of the light path.
Figure 28
Figure 29
Figure 30
3
1
2
2
1
