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Leica M-series User Manual 94
Light intensity control
•
Observe the user manual—in particu-
lar, all safety regulations—from the
manufacturers of the light guide and cold light
source.
Switch on the cold light source according to
ρ
the manufacturer's user manual and adjust
the brightness.
Transmitted-light control
The Leica TL BFDF transmitted-light base has
a control that switches the light from "bright
field" to "dark field".
Bright field
Bright field is suitable for examining translu-
cent objects featuring contrasting structures.
The object is directly illuminated from below
and is seen in its natural colors against a bright
background.
Turn the control as far as it will go towards
ρ
"BF" ("bright field").
Dark field
In dark-field illumination, a ring illuminator is
used in such a way that the direct light does
not reach the objective without a specimen.
Only the structure of semitransparent, opaque
objects disperses the light, making the object
visible against a dark background.
Turn the control as far as it will go towards
ρ
"DF" ("dark field").
Leica TL BFDF Transmitted-light Base: Operation
Fingertip with bright field illumination Identical subject with dark field illumination