Light Sources; Aperture Diaphragm - Leica DM2700 M Instructions Manual

8.7 Light Sources

Transmitted Light and Incident Light with the
LH113 Lamp Housing
• Adjust the brightness with the dial (52.1)..
Note:
The color temperature of about 4500 K is constant
and independent from the adjusted light intensity.
Note:
The
HI PLAN xx SL
HI PLAN CY xx SL
(Synchronized Light) objective lines permit ob-
jectives to be changed without adjusting the light
intensity.
Note:
If other light sources are used, for example Leica
EL6000, Leica SFL100/4000/7000 or lamp housings
with supply units, observe the separate instruc-
tion manuals provided.
Fig. 52
1 Brightness control
2 Field diaphragm control
1
and
2
• If present, switch on the external power unit of
the light source.
Caution!
Keep the lamp housing at least 10 cm away
from the wall, curtains, wallpaper, books and
other combustible objects! Fire Hazard!

8.8 Aperture Diaphragm

The aperture diaphragm defi nes the resolution,
depth of fi eld and contrast of the microscopic
image. The best resolution is obtained when the
apertures of the objective and the condenser are
roughly the same.
When the aperture diaphragm is stopped down
to be smaller than the objective aperture, resolv-
ing power is reduced, but the contrast is en-
hanced. A noticeable reduction in the resolving
power is observed when the aperture diaphragm
is stopped down to less than 0.6x of the objective
aperture and should be avoided where possible.
In polarization microscopy, stopping down the
aperture diaphragm generally results in more in-
tense colors.
The aperture diaphragm is set according to the
viewer's subjective impression of the image, the
scale on the dial just serves to allow reproduc-
ible settings and does not represent absolute ap-
erture values.
8. Operation
51