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8. Operation
8.6 Objectives
Changing Objectives
For Leica DM2000 and DM2500, the objectives
are manually swung into the beam path. Be sure
that the nosepiece turret locks into place.
For Leica DM3000, the operation is carried out
via the front control panel and via the lateral
function keys → p. 49.
When you rotate the objective into position, the
settings for
• field diaphragm → p. 54
• aperture diaphragm → p. 53
• light intensity → p. 52
should be checked.
Note:
For Leica DM3000, the light intensity is automati-
cally adjusted after the objective change.
Fig. 55a Immersion objective (released)
48
• For immersion objectives use the appropriate
immersion medium.
OIL:
only use optical immersion oil
according to DIN/ISO standards.
Cleaning → p. 70.
W:
Water immersion.
IMM: Universal objective for water, glycerol,
oil immersion.
Caution!
Follow safety instructions for immersion oil!
Note:
For lockable immersion objectives, lock these by
pushing the front part upward until it stops
(approx. 2 mm). Then, after a gentle turning mo-
tion to the right, the objective is locked
(Fig. 55b).
For objectives with corrective mounts, turn the
knurl to adjust the objective to the thickness of
the cover glass.
Fig. 55b Immersion objective (locked)
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