Leica DMi1 Instructions For Use Manual page 19

Aperture diaphragm
The aperture diaphragm defines the resolution,
focus depth and contrast of the microscopic im-
age. The best resolution is obtained when the
apertures of the objective and the condenser are
roughly the same.
Caution!
The aperture diaphragm in the illumination
light path is not for setting the image bright-
ness. Only the rotary brightness adjustment
knob or the neutral density filter should be
used for this purpose.
Condenser
The condenser is a lens system that collects the
light and directs it to the specimen from the top.
The condenser serves to utilize the numerical ap-
erture in the objective.
Fig. 9 Insert of transmitted light filter
4. Overview of the Instrument
Stop screw for condenser height adjustment
The stop screw is used for fixing condenser
height adjustment by moving the transmitted light
illumination column. The markings on the trans-
mitted light column indicate the proper height to
be set for the condenser used.
For S40 condenser, the working distance can
be changed between 40mm and 50 mm. The
S80 condenser, has a fixed working distance of
80mm.
Specimen stages and accessories
The specimen stage is used to support the speci-
mens to be subjected to microscopic examina-
tion. For microscopy with the different speci-
mens, multiple options are available, such as the
attachable object guide and inserts.
Fig. 10 Transmitted light illumination system
19