B270 User Guide
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2.3c Centering the Condenser
The condenser can also be centered to improve alignment with the set objective lens. Two recessed centering screws are
located on the front of the condenser-holder -- one on either side of the locking screw. Adjustment requires a 2.5mm hex
wrench. Rotating either screw clockwise will increase tension and push the condenser diagonally. Because the micro
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scope’s viewing head produces an inverted image, the condenser will appear to move in a direction opposite the me
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chanical movement.
To center the Abbe condenser, its iris diaphragm must be used as reference. This is ideally done using a telescoping
eyepiece which can be adjusted to focus on the condenser’s iris. Otherwise, an eyepiece can be removed from the
viewing head, allowing you to view an image of the iris inside the ocular tube. The illuminator must be active to provide
the necessary light, but the brightness should be adjusted to a low level since you will be looking directly at the light.
With the condenser raised to its maximum height, you should see an image of the iris. Use the condenser’s adjustment
lever to increase or decrease the size of the aperture until it is slightly smaller than the field of view. Tightening the right
screw will move the image of the iris downward and to the right. Tightening the left screw will move the image of the iris
downward and to the left. Loosening either screw will move the image of the iris in an opposite direction. Make gradual
adjustments to both screws until the iris appears centered in the field of view. You can increase or decrease the aperture
as needed to gauge the alignment.
