Leica DM2700 M, Instructions Manual

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50
8. Operation
8.6 Objectives
Changing Objectives
The objectives are pivoted into the beam path
manually. Be sure that the nosepiece turret locks
into place.
When you rotate the objective into position, the
settings for
• fi eld diaphragm
→
p. 53
• aperture diaphragm
→
p. 51
• light intensity
→
p. 51
should be checked.
• For immersion objectives use the appropriate
immersion medium.
OIL: use optical immersion oil only
according to DIN/ISO standards
Cleaning
→
p.69
W: Water immersion
IMM: Universal objective for water, glycerol,
oil immersion
Caution!
Follow the safety instructions for immersion
oil!
Note:
For lockable immersion objectives, lock these by
pushing the front part upwards until it stops (ap-
prox. 2 mm). Then, after a gentle turning motion
to the right, the objective is locked (Fig. 51).
For objectives with corrective mounts, turn the
knurl to adjust the objective to the thickness of
the cover glass..
↔
↔
Fig. 50 Immersion objective, released Fig. 51 Immersion objective, locked