Leica M Series User Manual Bases 98
Leica TL RCI: The Deflection Mirror
Inverted world?
Depending on the properties of the specimen
(refractive index of the environment) and the
perception of the viewer, it is possible that
the switches described below for positive and
inverted relief contrast are to be operated
in reverse. This means that the lower switch,
rather than the upper switch, controls inverted
the relief contrast and vice-versa.
Tilted mirror
The built-in mirror features one flat and one
concave side and can be rotated and moved.
The concave side is intended for use at high
magnifications to increase the NA of the base.
The flat side is designed to deliver even an
illumination at low magnifications. The black
rotary knob on the left side of the transmitted-
light base can be used to rotate the built-in
path-folding mirror and move it forwards/back.
The concave cutout on the handle indicates the
concave side of the mirror, allowing intuitive
operation at any time without eye contact.
The angle of light incidence in the specimen
plane changes depending on the tilt and
position of the mirror. As a result, switching
between transmitted light bright field, oblique
illumination and dark field-like illumination is
possible.
Functions of the rotary knob
The rotary knob (1) fulfills the following tasks:
O Turning the deflection mirror from the flat
to the concave side
O Slight tilting to guide the light beam
through the specimen plane at a steeper or
flatter angle
O Moving the deflection mirror (forwards/
back)
1
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