11
4
Using the ND Filter Knob
(Fig. 12)
}The ND filter is interlocked with the brightfield (BF) light path switching so
it can be engaged or disengaged according to the mirror selector lever
@. The ND filter makes it possible to reduce the glare when darkfield (DF)
is switched to brightfield (BF).
Releasing Interlocking
}The ND filter knob has been interlocked at the factory.
}If brightness is not enough during brightfield, DIC or other observation,
the interlocking can be released.
1. Loosen the screw interlocking the ND filter by inserting the Allen screw-
driver into the hole ² on the left side of the reflected light illuminator.
2. Now the interlocking is released and the ND filter knob (| in Fig. 11) is
active. Pull the lever out to disengage the ND filter from the light path.
5
Using the Filters
(Fig. 13)
}Engage the optimum filter sliders for the purpose of observation in the
two filter insertion slots @. Be sure to engage from the left side.
The first click position is the idle position and the second click engages
the filter in the light path.
Usable Filters
Applications
U-25LBD
(Color temperature conver-
sion filter)
Turns the illumination light into daylight.
Used in general observations and color pho-
tography.
U-25IF550
(Green filter)
Enhanced contrast in monochrome obser-
vation.
Used in monochrome photography.
U-25Y48
(Yellow filter)
Contrast filter for observation of semicon-
ductor wafers.
U-25ND50-2 (Light intensity
adjustment filter)
Adjusts the brightness of the light source.
(Transmittance: 50%)
U-25ND6-2 (Light intensity
adjustment filter)
Adjusts the brightness of the light source.
(Transmittance: 6%)
U-25FR
(Frost filter)
Reduces irregularity in the illumination field,
but also reduces the brightness.
U-25L42
(UV cut filter)
Cuts ultraviolet rays. Used to prevent the po-
larizer from being burned by a high-inten-
sity light source.
Fig. 12
Fig. 13
@
²
@
U-25ND25-2 (Light intensity
adjustment filter)
Adjusts the brightness of the light source.
(Transmittance: 25%)
Summary of Contents for BX51M
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