Operation Of Objectives - Leica DMIL Mode D'emploi

Operation of objectives

Immersion objectives
OIL: Use optical immersion oil in compliance
with DIN/ISO only.
Cleaning → p. 57, Labelling → p. 67 pp.
Attention:
Observe the safety instructions for immer-
sion oil!
W: Water immersion. The special water
immersion objectives with a ceramic front can
be used for all aqueous solutions.
IMM: Universal objective for water, glycerine,
oil.
Colour codes of objectives → p. 69
Locking of objectives
Some immersion objectives (identified by a
knurled grip) can be virtually shortened (locked).
This stops any remaining drops of immersion li-
quid from inadvertently wetting objectives and
other objects.
• Push in the front part by about 2 mm in the
direction of the nosepiece.
• Lock the objective by rotating it slightly.
42
!
Attention:
The locking mechanism must always be
released before the immersion objective is used
again, since otherwise the spring mechanism
protecting the speciment and the objective is
ineffective and the other objectives are no
longer parfocal with the immersion objective.
CORR objectives
These are special objectives which can be
adjusted to different coverglass thicknesses.
• Adjust the correction mount coarsely to an
average or estimated value by using the
knurled grip.
• Focus the preparation.
• Readjust the correction mount until you obtain
an optimum contrast, which may require
refocusing with the fine adjustment.