Leica DM3 XL, Инструкция по эксплуатации

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38
11. Trouble Shooting
Problem
Brightfield
The specimen can not be brought into focus.
Darkfield
No definite DF contrast is possible.
The image is unevenly or not uniformly illumi-
nated.
Undesirable stray light.
Cause/Remedy

Use the correct immersion medium.

Lay the specimen with the cover glass toward
the top.

Make sure that the cover glass thickness is
correct and that it suits the indication on the ob-
jective.

Be sure that a DF objective is being used.

The objective aperture setting is too high
(maximum 0.75/1.10). If necessary, reduce the ob-
jective aperture using the iris diaphragm on the
objective.

Check the condenser centering.

Open the aperture diaphragm completely.

The magnification is too weak.
Use a higher magnification.

Incident light: Open and center the aperture
diaphragm.

Clean the specimen and neighboring lenses
( → p. 40).