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15
7.
Darkfield Condenser Installation and Operation
Instructions
7.1 Dry darkfield condenser of A191-INF
1) Mounting the dry darkfield condenser
Loosen the condenser lock thumb screw on the condenser holder and remove the
brightfield condenser as shown in
Fig. 11 (a)
.
Install the dry darkfield condenser and tighten the condenser lock thumb screw on
the condenser holder as shown in
Fig. 11 (c)
.
2) Centering the dry darkfield condenser
Turn the 4X objective to the light path.
Turn the condenser focus knob to lower the
condenser till a dark spot showed in the viewing field
as shown in
Fig. 12
(a)
.
Turn the condenser translational centering screws to
move the dark spot to the center as shown in
Fig. 12
(b)
.
3) Place the slide on the stage.
4) Raise the condenser all the way to the top and lower it a little bit.
5) Following the procedures in this manual to focus and observe.
6) Move the condenser up or down slightly to get the best darkfield viewing.
Note
：
The dry darkfield condenser is used with the dry objectives only.
The dry darkfield condenser works with the 4X, 10X, 40X objectives.
The dry darkfield condenser won
’t work with the 100X oil immersion objective.
(a) (b)
Fig.11
(a)
(b)
(c)
Fig.12
(a)
(b)
Condenser Centering Screws
(C)
Condenser Lock Thumb Screw
(c)
Condenser Holder
