User Guide

490 Series Microscope
AmScope Proprietary Page 18 of 64
6. Adjust the focusing knob, watch for the field of view to
come into focus. This is best seen when the iris of the
condenser is smaller than the field of the objective. Use
the fine focusing knob to make adjustments.
7. Re-engage the stage stop limit.
8. When the specimen is in focus, adjust the iris to open
just larger than the condenser’s diameter.
9. After using the oil immersion lens, you will need to clean the lens and
specimen before the oil dries.
Note: Please be careful when using the stage stop limit. The stage limit
stop is designed to prevent impact between objective and slide, so when it
is off you can damage the microscope or the slide.