Llutico DN-107T Bedienungsanleitung Seite 28

Fig.18
Magnification：10×
N.A.：0.25
Image of Aperture Iris Diaphragm
Fig.19
①
Specimen
●
The tight tension of the coarse focus knob has
already been adjusted before leaving factory. If
loosen (e.g. the stage slip down by its weight),
please screw the intention adjustment collar③
to the right position by the supplied spanner.
3.2.4 Condenser Adjustment (Fig.18)
Turn the condenser focus knob to move the
condenser up and down. Raise the condenser
when using the high magnification objective,
and descend it when using the low magnification
one.
★ The condenser and the objective are coaxial. It
has been adjusted before leaving factory, so the
user needn't to adjust them by self (the distance
between the top of the condenser and the stage
should be in the range of 0.03mm~0.4mm.)
★ The highest position of the condenser has been
adjusted too. It also needn't any user's operation.
3.2.5 Aperture Iris Diaphragm Adjustment
(Fig.18, 19)
Turn the aperture iris diaphragm lever① to
adjust the aperture iris diaphragm.
Generally, setting the aperture iris diaphragm
to 70- 80% of the N.A. of the objective in use will
provide an image with good contrast.
●
If the size of the aperture diaphragm minified,
the brightness and the resolution declined,
while the contrast and the depth of field
increased; In other words, if the size largen,
the brightness and the resolution improved,
but the contrast and the depth of field declined.
●
Generally, setting the size of the condenser
aperture diaphragm at 70% ～ 80% of the
numerical aperture, you can obtain a clear
image with enough contrast. If the open of
the perture diaphragm is too small, the resolution
were very low, so please don't minify the aperture
below 60% of the objective's numerical aperture
unless in a special case, for instance, observating
an almost transparent specimen.
10
DN-107T-US