EXI-600 INVERTED MICROSCOPE SERIES
ACCU-SCOPE
®
73 Mall Drive, Commack, NY 11725 • 631-864-1000 • www.accu-scope.com
28
6.1.5.
Condenser turret: Centering phase contrast annuli
Phase contrast annuli ship preinstalled in the condenser turret and are pre-centered. Centering is
recommended as some movement may have occurred during transit.
Phase contrast observation and centering of the phase contrast annuli requires phase contrast
objectives. These can be readily identified by green markings on the objective barrel and include a
marking that indicates the appropriate phase contrast annulus to use (i.e., Ph1 for 10X, Ph2 for 20X and
40X, Ph3/L (optional) for 60X or 4X, respectively).
Place and focus on a specimen on
the stage.
Change to the phase contrast
objective for which the
corresponding phase annulus will
be centered.
Change the condenser turret to the
phase annulus position (Ph1, Ph2,
Ph3/L) that corresponds to the
objective magnification.
The condenser diaphragm is fully
open automatically.
Engage the built-in Bertrand lens
by moving the black knob on the
front of the observation tube to the
“B” position.
While looking through the
eyepieces, two rings are visible
and of nearly the same size – one
dark and one bright.
If the two rings are of vastly
different sizes, the wrong phase
contrast annulus is in position.
Turn the condenser turret to the
correct phase position.
The black knob of the Bertrand
lens slider may be turned to help
focus the rings.
The dark ring is fixed and located
in the objective – this ring cannot
be moved.
Insert each of the two 1.5mm hex
screwdrivers into the centering
screws (left and right) of the
condenser.
