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9. Imaging Procedure for Leica DM4000 M
9.1 Incident Light
9.1.1 Bright Field
• 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
9.1.2 Dark Field
• 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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