Adjusting The Field Diaphragm Of The Reflected Light Illumination; Using The Field Diaphragm (Fs) - Olympus BXFM Instructions Manual

3-10 Adjusting the field diaphragm of the reflected light illumination

The picture shows BX3M-RLAS-S.
The same operation parts are also provided to
BX3M-URAS-S.
1

Using the field diaphragm (FS)

When BX3M-RLAS-S or BX3M-URAS-S is combined
1
a
a
Move the field diaphragm knob a of the reflected light illuminator
vertically to adjust the field diaphragm.
Field diaphragm knob position
5
Field
Open to
maximum
diaphragm
Scale of the field diaphragm knob
When using the units described in the following tables, aligning
the position of the field diaphragm knob a with the number
shown in the table enables to increase the contrast of the
observation image. Narrowing down the field diaphragm
increases the contrast furthermore and prevents the flares.
Note, always set to 5 for the darkfield observation.
<When observing the image with eyepiece>
U-SWTR-3
U-SWETTR-5
(Field number: 26.5)
Field
diaphragm
knob position
<When acquiring the image with camera>
Set the field diaphragm knob position according to the combination of the
image sensor size and the camera adapter as shown in the table below.
Note, the image sensor size of DP22/DP73 is 1/1.8 inch and the image
sensor size of DP27 is 2/3 inch.
When BX3M-RLAS-S is combined
Image sensor
size
1/3.2
Camera inch
adapter
0.5X 2
0.63X 1
1X 1
3
Observation tube
Others
(Field number: 22)
4 3
1/2.5
1/1.8 inch
inch
1/3 inch
2/3 inch
1/2 inch
2 3 3
2 2 3
1 1 2
BXFM
1
Close to
minimum
1 inch
5
4
3
25