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5-4 Condenser
•
Fig. 39
o
I).
'--4
'
\
)
'_'oJ
Field
iris
diaphragm
BX50
•
Condenser Centration
(Figs.
39,40,4' ,42)
1, Turn
the
condenser height adjustment knob
CD
and raise
the
condenser
to
its upper limit.
(fig.
39)
2 Focus on the specimen
uSing
the lOX objective
*
When using the
U
-SC
swing-out
condenser,
move
the
front
lens
into
t
he light
path.
3. Rotate the field
Iris diaphragm
flng
@
in
the
direction of the arrow to
reduce
the
aperture.
4.
Turn the condenser height adjustment knob
(j)
10 where the Image of
the Ins diaphragm IS vIsible in sharp focus.
5.
Turn the
two
condenser centering screws@tomove
the
Image
of the
field
iris
diaphragm
10 the center of
the
field
of
view.
6. Gradually open
the
field Ins diaphragm. The condenser is properly centered
If
the iris
Image 15 centered and inscribed In
the
field of view
..
7.
Dunng actual use, increase the field stop slightly so tha
t
Its Image IS
,ust outside the field of View,
Field Iris Diaphragm
(Fig.
40)
The field ins diaphragm restricts the diCImeter of the beam of light
entering the condenser and thus excludes extraneous light, Improving
Image contrast. The diameter of the
fi
eld IriS should
be
adjusted for
objective power to the extent that It lies
Just
outside the field of view
"Compatibility of objectives and condensers" on the next page,)
When photographing specimens, stop the field stop down to where It
IS somewhat larger than the firm format@toobtaln even better results.
~·----------------------------
18
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