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Leica M series Manual 79
Light intensity control
Please observe the user manual—in
particular, all safety regulations—from
the manufacturers of the light guide and cold
light source.
Switch on the cold light source according to ★
the manufacturer's user manual and adjust
the brightness.
Transmitted-light control
The TL BFDF transmitted-light base has a poten-
tiometer 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 ★
"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 speci-
men. 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 ★
"DF" ("dark field").
Transmitted-light Base TL BFDF: Operation
Fingertip with bright field illumination Identical subject with dark field illumination