Leica DM4000B Manuel D’Utilisation

58

• Switch to the incident light axis (IL) by pushing

the TL/IL button.

• Select the BF (bright field) contrast method.

Do so by pressing the BF variable key.
Alternatively: Press the CHANGE RL
variable key.
(For key occupation please see “Identification
Sheet”.)
The display indicates BF.

• Insert a specimen.

• Rotate an appropriate objective into place.

• Bring the image into focus using the focus dial

and set the brightness using the INT function
key.

9. Imaging procedure

for Leica DM4000 M

• Switch to the incident light axis (IL) by pushing

the TL/IL button.

• Select the DF (dark field) contrast method.

Do so by pressing the DF variable key.
Alternatively: Press the CHANGE RL
variable key.
(For key occupation please see “Identification
Sheet”.)
The display indicates DF.
The DF reflector is turned into the beam
path.

• Insert a specimen.

• Rotate an appropriate objective into place.

• Bring the image into focus using the focus dial

and set the brightness using the INT function
key.

 Notes:

• The maximum objective aperture which may

be used for dark field is 0.75. All objectives
with greater aperture are automatically
blocked for this procedure ("DF" flashes in the
display).

• When selecting the dark field method, the

aperture diaphragm is opened completely and
may not be adjusted. To avoid errors in opera-
tion, the function keys for setting the aperture
diaphragm (AP) are locked.

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