Optika Italy B-290 Serie Mode D'emploi page 22

7. Rotate the upper part of the centering telescope (Fig. 35)
until the two phase rings (one dark ③ and one bright ②)
visible in the telescope are in focus. (Fig. 36)
8. Using centering screws on the slider ④ (Fig. 37), center the
phase rings to make the bright ring
dark ring ③. (Fig. 38)
9. Move the condenser slider all the way toward right to insert
the phase ring dedicated to 40X objective.
10. Insert 40X objective into the light path.
11. Repeat steps 7. and 8. to check the centering of the 40x
phase ring.
12. At the end, remove the centering telescope, reinstall the
eyepiece and begin observation.
• With 40x objective it may be useful to slightly raise the
condenser, to obtain a better projection of the phase
rings. This is not a defect.
• With the 4X objective, the condenser could have a dark
halo at the periphery of the field of view. This is not to be
considered a defect.
be concentric to the
②
Page 22
CONDENSER
PHASE RING
(BRIGHT)
②
OBJECTIVE
PHASE RING
(DARK) ③
④
F ig. 36 F ig. 36
F ig. 37 F ig. 37
F ig. 38 F ig. 38