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79
Centration of the condenser prisms
If you have ordered a complete microscope, this
adjustment will already have been made at the
factory. However, it is advisable to check the
centration from time to time, particularly after
transport: disengage the objective-side IC
prisms (pos. H).
Remove an eyepiece from the eyepiece tube.
Engage the condenser-side IC prisms one after
the other (the whole-wave compensator must
not be active, i. e. the lambda engraving is on the
bottom side of the analyser). When the cen-
tration is correct, the dark stripe must be in
the centre of the pupil (= brighter circle) of the
objective (Fig. 65).
If not, proceed as follows:
Put one of the supplied centring keys in the disc
opening on the
left of the label plate for the IC
prism (e. g. 64.2) (Fig. 65) and turn it to centre the
stripe.
Objectives for ICT
Transmitted light interference contrast is
possible with the brightfield and phase contrast
objectives which have the code letter of the
pupil position in the first line of engraving, e.g. A
(see separate objective chart).
An IC condenser prism, e.g. K6, must also be
available for the objective. An up-to-date table
of possible prism combinations (objective chart)
is enclosed separately with each configuration.
Fig.␣ 65
Objective pupil with correctly centred compensation stripe
Fig.␣ 66 Centration for interference contrast
1 Centring keys in working position
1