User Guide

490 Series Microscope
AmScope Proprietary Page 15 of 64
2.10 Setting the Condenser Lens Adjustment Knob
The condenser adjustment knob raises and lowers the
condenser’s distance to the base lens, varying light
delivery.
2.11 Adjusting the Iris
By changing the aperture (hole size) of the iris/diaphragm
of the condenser, you can adjust the background
brightness. Adjust the aperture of the iris diaphragm using
the iris adjustment slider located directly under the stage.
2.12 Changing a Filter
1. At the bottom of the condenser lens, there is a small
ring that slides out. Swivel the ring as far out as
possible.
2. Insert the preferred colored glass filter.
3. Slide the ring back into place.
Note: The filter holder is placed in from the factory in a manner in which it swings out
and hits the arm of the microscope (backwards). If this happens, simply grip
the condenser assembly and rotate it. It may take a small amount of force to
rotate it, but after doing so, you will be able to swing the filter holder out
towards the front of the unit for easier operation.