Focus And Diopter Adjustment; Condenser Adjustment; Set The Numerical Aperture - Optika B-190 Bedienungsanleitung

4.0 USING THE MICROSCOPE
4.5

Focus and diopter adjustment

Rotate the coarse focusing knob to bring the slide into focus using an objective with a low
magnification. Adjust the fine focusing knob to get the image sharp and clear while observing
with your right eye, then turn the dioptric adjustment ring on the left eyepiece until a sharp
and clear image can be observed also with the other eye. Turn the tension-adjust-knob to
get a suitable tension for the focus system. When the image is in focus, turn the nosepiece to
choose the objective you need.
4.6

Condenser adjustment

Hold the notched ring at the base of the condenser and rotate it up or down until you reach a
clear and uniform sample illumination.
HOLD THIS
NOTCHED RING
AND ROTATE IT
4.7

Set the numerical aperture

Adjust the aperture of the iris diaphragm to set the numerical aperture of the illuminator, thus
controlling image contrast and resolution.
4.8 Additional filters
The green glass filter can be inserted in the flip-out filter holder underneath the condenser.
Page 6