Condensers; Abbe Condenser; Darkfield Condenser; Achromat/Aplanat Condenser - Nikon Labophot Instruction Manual

3. Condensers
1) Abbe condenser
NA = 1.25. This is used with 4X - 100X ob-
jectives. The graduation of this condenser
indicates the diameters in mm of the aperture
diaphragm opening.
2) Swing-out Achromat condenser
N.A.
=
0.9. Dry system.
It is used in combination with objectives from
2X to 100X, and provided with a swing-out top
lens which is to be swung out when using the
2X or 4X objective. Its adjustable aperture scale
is graduated in N.A. ratings.
3) Achromat/aplanat condenser
NA
=
1.35. Oil system.
The spherical, coma and ch rom<ltic aberrations
being ideally corrected, this large aperture
condenser is used with 20 X - 100 X ob jectives.
The standard thickness of glass slide should be
1.2mm.
Apply oil between the condenser and glassslide.
It is recommended that this condenser be
employed especially in combination with the
Plan Apochromat objectives. When using the
lOOX objective for observation in combination
OPTICAL PATH
Collector
lens
Halogen
lamp
14
with the CFW lOX eyepiece, it is possible to
close the field diaphragm down to 45% of the
viewfield.
4) Darkfield condenser (Oil)
N.A.
=
1.43 - 1.20. Oil system. Used in dark-
field microscopy. Apply oil between the
condenser and glass slide. (It is recommended
to use a thinner glass slide.)
This condenser is used in combination with the
objectives lOX - lOOX with aperture dia-
phragm (N.A.: up to 1.11.
5) Darkfield condenser (Dry)
N.A.
=
0.95 - 0.8. Dry system. Used in dark-
field microscopy. Magnifying powers of usable
objectives are lOX - 40X (N.A.: up to 0.7).
4. Illumination System
(Fig. 15)
The optical system for illumination in the
LABOPHOT microscope is constructed to fulfill
the Koehler illumination requirements perfect-
ly, and offers a bright, uniform field without
any change-over manipulation.
As a standard light source, use the Halogen
lamp 6V 20W (PHI LIPS 7388).
Objective
Filter
Field lens
Fig. 15