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7. Start-up
• Swivel in a suitable objective and focus on the
specimen.
• If necessary, swing in the condenser top.
The condenser top is swung out for objective
magnifications < 10x.
• Set the Köhler illumination (→ p. 34).
• In place of an eyepiece, insert the focusing
telescope (Fig. 36) into the observation tube.
• Engage the condenser-side prisms one after
the other and focus the telescope on the dark
diagonal compensation stripe (40). by slightly
loosening the clamping ring (36.2) and moving
the eye lens (36.1). The compensator must be
inactive, i.e. the engraving λ must be on the
lower side of the analyzer or the λ and λ/4
compensator must be removed.
38
The dark stripe should be in the center of the
brighter circular area. If not, proceed as follows:
• Make sure that the right-hand centering
screw for the light rings is not turned too far
inward or it may obstruct the movement of the
prism with the left-hand key.
• Push in the left-hand centering key on the
back of the condenser until it clicks into posi-
tion and rotate it until the stripe is in the
center of the circle.
The right-hand key is not required.
Fig. 40
Objective pupil with correctly centered compensation
stripe.
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