Leica TL BFDF Transmitted-light Base: Operation

Light intensity control

Observe the user manual—in particu- lar, all safety regulations—from the

manufacturers of the light guide and cold light source.

ρρ Switch on the cold light source according to 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.

ρρ 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 specimen. Only the structure of semitransparent, opaque objects disperses the light, making the object visible against a dark background.

ρρ Turn the control as far as it will go towards "DF" ("dark field").

Fingertip with bright field illumination

Identical subject with dark field illumination

Leica M-series

User Manual

94

 

 

 

Page 94
Image 94
Leica M205 FA Leica TL Bfdf Transmitted-light Base Operation, Manufacturers of the light guide and cold light source