Adjusting The Aperture Diaphragm - Olympus MX63 Instructions Manual

3-10 Adjusting the aperture diaphragm

a
b
c
38 38
The aperture diaphragm is used to adjust the numerical aperture of the
illumination system. Matching the numerical aperture of the illumination
system with that of the objective to be used offers an image with
optimum contrast and also increases the focal depth of image. However,
this adjustment may decrease the resolution and brightness.
In general, adjusting the numerical aperture to 70% to 80% of that of the
objective allows you to obtain a well-balanced image.
· During brightfield (BF) observation, the aperture diaphragm is
TIP
set per each objective automatically according to the setting
of the AS.PRESET switch a . For setting procedures, see
"Setting the AS.(aperture diaphragm) PRESET switch" (P.99).
d
· During darkfield (DF) observation, the aperture diaphragm
is set to the OPEN position automatically. (The aperture
diaphragm open/close buttons b and c on the front panel
are used for fine adjustment during BF observation.)
If you keep pressing the aperture diaphragm open/close button b
1
or c , the aperture diaphragm opens or close at a constant speed.
If you release your finger from the button, the aperture diaphragm is
set at the current position.
Checking the setting status
The current setting can be confirmed by ON or OFF of the aperture
diaphragm open/close buttons on the front panel.
Front panel
· As the aperture diaphragm value fine-adjusted here is not
TIP
stored, it will be returned to the setting value automatically
when the objective is changed.
· To prevent the malfunction of the aperture diaphragm open/
close buttons, use DIP switches d of the microscope frame
to disable the function.
For setting procedures, see "Setting the DIP switch /
AS.PRESET switch" (P.98).
( : ON,
Setting status
Same as the AS PRESET value
(No button operation)
Larger than the AS PRESET value
Larger than the AS PRESET value
: OFF)