Optika Italy B-380 Manual De Instrucciones página 11

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Take one of the eyepieces out of the tube, and insert the centering telescope. Loosen the screw of the tele-
scope and move its upper part in order to view a sharp image of the phase ring, then lock the screw:
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Typically, you have to see a pair of rings: one brighter and one darker. The bright one is the image of the an-
nulus on the condenser, while the dark one is the phase ring inside the objective:
Image as seen in the telescope
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Press both the long screws on the sides of the condenser and then slowly turn them until you notice that the
bright ring changes its position:
Telescope's screw
Page 11
Adjustable upper part