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
int
o the 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
fi
eld iris diaphragm
10
t
he
cen
t
er
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 that Its Image
IS
,ust outside the field
of
View,
Field
Ir
is
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
Jus
t 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
c
~
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G\
;!
m
n
a
z
:;j
a
r
en
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