Leica DM IRB manual Operation of objectives, Immersion objectives, Colour coding of objectives

Operation of objectives

Immersion objectives

OIL: Only use DIN/ISO standard immersion oil.

n. b.:

Observe the safety information on the im- mersion oil!

W:Water immersion. The special water im- mersion objectives with ceramic front part can be used for all hydrous solutions.

IMM: Universal objective for water, glycerine and oil.

Colour coding of objectives

→“Technical data”.

Locking objectives

Some immersion objectives (with knurled grip) can be locked in a shorter position. This pre- vents any remaining drops of immersion liquid from wetting other objectives or specimens when the nosepiece is turned.

●Press up the front part by about 2 mm.

●Lock the objective in this position by rotating slightly.

!n. b.:

When using the immersion objective again, remember to release the lock, as otherwise the spring mechanism that protects the specimen and objective will not work and the other objectives will no longer be parfocal with the immersion objective.

CORR objectives

These are special objectives which can be adjusted to the thickness of the coverslip.

●Roughly set the correction mount to a medium or estimated value by turning the knurl.

●Focus the specimen.

●Adjust the correction mount until you obtain obtimum contrast, fine-tune the focus with the fine drive if necessary. This setting may be very difficult for featureless or low-contrast areas of the specimen.

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