Leica DM R Serie Mode D'emploi page 51

W
Water immersion objective. Use distilled, or at
least demineralized water, if possible, as it is
often difficult to remove the sediment from
drops of water that have dried on the objective.
IMM
Universal immersion objective for water, salt
water, glycerine, oil.
Locking of objectives
The front part (41.1 and 41.2) of certain
immersion objectives can be pushed in by about
2 mm and slightly rotated. This stops any
remaining drops of immersion liquid from
wetting objects and other objectives when the
nosepiece is turned.
!
Attention:
This locking device must be released before the
immersion objective is used again, as otherwise
the spring mechanism protecting the specimen
and the objective is inactive and the other
objectives are not parfocal with the immersion
objective.
CORR Objectives
Special objectives with adjustable matching to
the coverglass thickness: Set correction mount
(not illustrated) approximately by turning the
knurl to the average or estimated value: focus
the B specimen (→ Fig. 25).
Adjust the correction mount until you achieve
optimum contrast, refocusing with the fine
control if necessary. This setting may be very
difficult for specimens with low contrast or
weakly pronounced structures.
Lens attachments
Can be pushed onto the front of some objec-
tives, or are readymounted at the factory:
Fig. 41 Examples of immersion objectives
1 Immersion cap for N PLAN 10x objectives (pos. 2), 2 N PLAN
10x dry objective, 3 Achromat, 4 Planachromat, 5, 6 Objectives
with push-in locking device at front
1 2 3 4 5 6
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